CVE-2023-45803

MEDIUMNVD 4.24.2
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This medium-severity CVE scores 4.2 under NVD CVSS v3. EPSS exploit probability: 0.6% (47th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
4.2EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 4.2Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

urllib3 is a user-friendly HTTP client library for Python. urllib3 previously wouldn't remove the HTTP request body when an HTTP redirect response using status 301, 302, or 303 after the request had its method changed from one that could accept a request body (like POST) to GET as is required by HTTP RFCs. Although this behavior is not specified in the section for redirects, it can be inferred by piecing together information from different sections and we have observed the behavior in other major HTTP client implementations like curl and web browsers. Because the vulnerability requires a previously trusted service to become compromised in order to have an impact on confidentiality we believe the exploitability of this vulnerability is low. Additionally, many users aren't putting sensitive data in HTTP request bodies, if this is the case then this vulnerability isn't exploitable. Both of the following conditions must be true to be affected by this vulnerability: 1. Using urllib3 and submitting sensitive information in the HTTP request body (such as form data or JSON) and 2. The origin service is compromised and starts redirecting using 301, 302, or 303 to a malicious peer or the redirected-to service becomes compromised. This issue has been addressed in versions 1.26.18 and 2.0.7 and users are advised to update to resolve this issue. Users unable to update should disable redirects for services that aren't expecting to respond with redirects with redirects=False and disable automatic redirects with redirects=False and handle 301, 302, and 303 redirects manually by stripping the HTTP request body.

CVSS v3
4.2
EG Score
4.2MEDIUMmedium confidence
EG Risk
19
EG Risk 19/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity42% × 45%
Impact severity (EG Severity): CVSS 4.2 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.6%
EPSS %ILE
47th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (4.2): severity, escalated by confirmed exploitation. This CVE's 4.2 is its impact severity (EG Severity), not escalated.

EG Severity
4.2 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.6% within 30 daysSource: FIRST EPSS. FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

October 17, 2023

Last Modified

June 17, 2026

References (7)

Vendor Advisories for CVE-2023-45803(14)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(20)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntupython3-urllib3 (1.25.8-2ubuntu0.3) @ focal2026-05-24ubuntu
ubuntupython3-pip (20.0.2-5ubuntu1.10) @ focal2026-05-24ubuntu
ubuntupython3-pip-whl (25.0+dfsg-1ubuntu0.2) @ plucky2026-05-24ubuntu
redhatpython3.11-urllib3-0:1.26.12-2.el9_4.22025-02-25redhat
redhatpython3.11-urllib3-0:1.26.12-1.el9_2.12025-02-25redhat
redhatpython3.11-urllib3-0:1.26.12-1.el8_8.22025-01-08redhat
redhatpython3.11-urllib3-0:1.26.12-5.el8_102024-12-17redhat
redhatpython3.11-urllib3-0:1.26.12-2.el9_5.22024-12-17redhat
redhatresource-agents-0:4.9.0-54.el82024-05-22redhat
redhatcontainer-tools:rhel8-8100020240227110532.828888972024-05-22redhat
redhatpython-urllib3-0:1.25.10-6.el8ost2024-05-22redhat
redhatfence-agents-0:4.2.1-129.el82024-05-22redhat
redhatfence-agents-0:4.10.0-62.el92024-04-30redhat
redhatodf4/rook-ceph-rhel9-operator:v4.15.0-1032024-03-19redhat
redhatfence-agents-0:4.10.0-20.el9_0.112024-03-05redhat
redhatpython-urllib3-0:1.24.2-5.el8_8.12024-01-30redhat
redhatpython-urllib3-0:1.26.5-3.el9_3.12024-01-25redhat
redhatpython-urllib3-0:1.24.2-5.el8_6.12024-01-18redhat
redhatpython-urllib3-0:1.24.2-5.el8_9.22024-01-10redhat
redhatpython-urllib3-0:1.26.18-0.1.el8pc2023-12-14redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(16 across 16 ecosystems)
Alpine:v3.15(1)
PackageVulnerable rangeFix by version rangeDependents
py3-urllib3—
  • every version up to 1.26.18-r0: fixed in 1.26.18-r0
—
Alpine:v3.16(1)
PackageVulnerable rangeFix by version rangeDependents
py3-urllib3—
  • every version up to 1.26.18-r0: fixed in 1.26.18-r0
—
Alpine:v3.17(1)
PackageVulnerable rangeFix by version rangeDependents
py3-urllib3—
  • every version up to 1.26.18-r0: fixed in 1.26.18-r0
—
Alpine:v3.18(1)
PackageVulnerable rangeFix by version rangeDependents
py3-urllib3—
  • every version up to 1.26.18-r0: fixed in 1.26.18-r0
—
Alpine:v3.19(1)
PackageVulnerable rangeFix by version rangeDependents
py3-urllib3—
  • every version up to 1.26.18-r0: fixed in 1.26.18-r0
—
Alpine:v3.20(1)
PackageVulnerable rangeFix by version rangeDependents
py3-urllib3—
  • every version up to 1.26.18-r0: fixed in 1.26.18-r0
—
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
py3-urllib3—
  • every version up to 1.26.18-r0: fixed in 1.26.18-r0
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
py3-urllib3—
  • every version up to 1.26.18-r0: fixed in 1.26.18-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
py3-urllib3—
  • every version up to 1.26.18-r0: fixed in 1.26.18-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
py3-urllib3—
  • every version up to 1.26.18-r0: fixed in 1.26.18-r0
—
Debian:10(1)
PackageVulnerable rangeFix by version rangeDependents
python-urllib31.24.1-1, 1.24.1-1+deb10u1
  • every version up to 1.24.1-1+deb10u2: fixed in 1.24.1-1+deb10u2
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
python-urllib31.26.5-1~exp1
  • every version up to 1.26.5-1~exp1+deb11u1: fixed in 1.26.5-1~exp1+deb11u1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
python-urllib31.26.12-1
  • every version up to 1.26.12-1+deb12u1: fixed in 1.26.12-1+deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
python-urllib3—
  • every version up to 1.26.18-1: fixed in 1.26.18-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
python-urllib3—
  • every version up to 1.26.18-1: fixed in 1.26.18-1
—
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
urllib30.2 ... 2.0.6 (87 versions)
  • 2.0.0 up to 2.0.7: fixed in 2.0.7
  • every version up to 1.26.18: fixed in 1.26.18
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(9)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 8× in last 7d / 33× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 91 of 205 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 9 repeat rows among the latest 100 are merged into the row they repeat. The 114 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-22 16:31 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  2. 2026-10-21 16:29 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  3. 2026-10-20 16:30 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  4. 2026-10-19 16:29 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  5. 2026-10-18 16:29 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  6. 2026-10-18 07:48 UTCEG score recompute
  7. 2026-10-17 16:30 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  8. 2026-10-16 16:36 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  9. 2026-10-15 16:29 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  10. 2026-10-14 16:30 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  11. 2026-10-13 16:30 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  12. 2026-10-12 21:24 UTCOSV refresh
  13. 2026-10-12 18:17 UTCEG score recompute
  14. 2026-10-12 16:31 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  15. 2026-10-11 21:43 UTCEG score recompute
  16. 2026-10-11 13:45 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  17. 2026-10-10 19:57 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  18. 2026-10-09 20:05 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  19. 2026-10-08 17:06 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  20. 2026-10-07 23:46 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  21. 2026-10-06 15:15 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  22. 2026-10-05 17:41 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  23. 2026-10-04 23:20 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  24. 2026-10-03 14:23 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  25. 2026-10-01 19:48 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
Show 66 more
  1. 2026-09-30 16:32 UTCEG score recompute
  2. 2026-09-30 15:01 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  3. 2026-09-29 15:17 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  4. 2026-09-28 13:49 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  5. 2026-09-27 13:42 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  6. 2026-09-26 00:22 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  7. 2026-09-24 14:01 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  8. 2026-09-23 13:46 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  9. 2026-09-22 19:09 UTCOSV refresh
  10. 2026-09-22 14:46 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  11. 2026-09-21 20:31 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  12. 2026-09-20 20:14 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  13. 2026-09-18 19:26 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  14. 2026-09-17 19:25 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  15. 2026-09-16 14:06 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  16. 2026-09-16 05:11 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  17. 2026-09-15 03:08 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  18. 2026-09-13 16:44 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  19. 2026-09-12 14:58 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  20. 2026-09-11 14:50 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  21. 2026-09-11 09:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  22. 2026-09-08 21:58 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  23. 2026-09-07 15:59 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  24. 2026-09-06 13:45 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  25. 2026-09-05 15:26 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  26. 2026-09-04 13:58 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  27. 2026-09-04 05:04 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  28. 2026-09-03 15:29 UTCOSV refresh
  29. 2026-09-02 14:09 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  30. 2026-09-01 13:51 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  31. 2026-09-01 04:35 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  32. 2026-08-30 19:15 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  33. 2026-08-30 01:20 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  34. 2026-08-28 21:39 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  35. 2026-08-27 14:23 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  36. 2026-08-26 14:44 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  37. 2026-08-25 13:46 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  38. 2026-08-24 14:14 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  39. 2026-08-23 00:17 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  40. 2026-08-21 23:47 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  41. 2026-08-20 22:53 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  42. 2026-08-19 17:02 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  43. 2026-08-18 13:46 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  44. 2026-08-17 13:45 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  45. 2026-08-17 04:53 UTCOSV refresh
  46. 2026-08-16 14:54 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  47. 2026-08-16 02:12 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  48. 2026-08-15 01:28 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  49. 2026-08-13 21:58 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  50. 2026-08-12 13:49 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  51. 2026-08-11 13:40 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  52. 2026-08-10 23:57 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  53. 2026-08-09 13:44 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  54. 2026-08-08 16:35 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  55. 2026-08-07 16:25 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  56. 2026-08-06 13:45 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  57. 2026-08-05 19:15 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  58. 2026-08-04 15:07 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  59. 2026-08-04 10:35 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  60. 2026-08-03 10:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  61. 2026-08-02 02:25 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  62. 2026-08-01 23:36 UTCOSV refresh
  63. 2026-08-01 04:14 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  64. 2026-07-30 16:26 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  65. 2026-07-30 01:28 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  66. 2026-07-28 15:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile

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Frequently asked(5)

What is CVE-2023-45803?
CVE-2023-45803 is a medium-severity vulnerability; its CVE record was published on October 17, 2023. urllib3 is a user-friendly HTTP client library for Python. urllib3 previously wouldn't remove the HTTP request body when an HTTP redirect response using status 301, 302, or 303 after the request had its method changed from one that could accept a request body (like POST) to GET as is required by…
When was the CVE record for CVE-2023-45803 published?
The CVE record for CVE-2023-45803 was published on October 17, 2023. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of June 17, 2026; the record at its source may have been updated since.
Is CVE-2023-45803 actively exploited?
CVE-2023-45803 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (47th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2023-45803?
CVE-2023-45803 has a CVSS v3 base score of 4.2 (NVD).
How do I remediate CVE-2023-45803?
A fix for CVE-2023-45803 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2023-45803 are linked in the Vendor Advisories panel on this page.

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