CVE-2018-1000030

LOWNVD 3.63.6
EchelonGraph scoreMEDIUM confidence

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

Score 3.6 from GitHub Security Advisory (severity: LOW) published 2022-05-13. NVD baseline CVSS 3.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
3.6EG
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: 1.2%CVSS: 3.6Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Python 2.7.14 is vulnerable to a Heap-Buffer-Overflow as well as a Heap-Use-After-Free. Python versions prior to 2.7.14 may also be vulnerable and it appears that Python 2.7.17 and prior may also be vulnerable however this has not been confirmed. The vulnerability lies when multiply threads are handling large amounts of data. In both cases there is essentially a race condition that occurs. For the Heap-Buffer-Overflow, Thread 2 is creating the size for a buffer, but Thread1 is already writing to the buffer without knowing how much to write. So when a large amount of data is being processed, it is very easy to cause memory corruption using a Heap-Buffer-Overflow. As for the Use-After-Free, Thread3->Malloc->Thread1->Free's->Thread2-Re-uses-Free'd Memory. The PSRT has stated that this is not a security vulnerability due to the fact that the attacker must be able to run code, however in some situations, such as function as a service, this vulnerability can potentially be used by an attacker to violate a trust boundary, as such the DWF feels this issue deserves a CVE.

CVSS v3
3.6
EG Score
3.6LOWmedium confidence
EG Risk
17
EG Risk 17/100

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)
Severity36% × 45%
Impact severity (EG Severity): CVSS 3.6 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation1.2% × 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
1.2%
EPSS %ILE
67th
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 (3.6): severity, escalated by confirmed exploitation. This CVE's 3.6 is its impact severity (EG Severity), not escalated.

EG Severity
3.6 LOWCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
1.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-17). 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

February 8, 2018

Last Modified

October 8, 2026

References (7)

Vendor Advisories for CVE-2018-1000030(1)

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

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntupython2.7 (2.7.3-0ubuntu3.11) @ precise2026-10-08ubuntu
ubuntupython3.5-venv (3.5.2-2ubuntu0~16.04.5) @ xenial2026-10-08ubuntu

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

(1 across 1 ecosystem)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
python2.7—
  • every version up to 2.7.14-5: fixed in 2.7.14-5
—

Weakness Classification(2)

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

All Vendor Advisories

(2)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 8× in last 7d / 35× 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 89 of 172 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. 11 repeat rows among the latest 100 are merged into the row they repeat. The 83 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-23 16:27 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  2. 2026-10-22 16:27 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  3. 2026-10-21 16:27 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  4. 2026-10-20 16:27 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  5. 2026-10-19 16:26 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  6. 2026-10-18 16:27 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  7. 2026-10-18 10:24 UTCEG score recompute
  8. 2026-10-17 16:27 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  9. 2026-10-16 16:29 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  10. 2026-10-15 16:27 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  11. 2026-10-14 16:27 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  12. 2026-10-13 16:27 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  13. 2026-10-12 20:22 UTCEG score recompute
  14. 2026-10-12 16:28 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  15. 2026-10-12 00:45 UTCEG score recompute
  16. 2026-10-11 13:41 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  17. 2026-10-10 19:55 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  18. 2026-10-09 20:02 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  19. 2026-10-08 21:26 UTCEG score recompute
  20. 2026-10-08 21:26 UTCVendor advisory
  21. 2026-10-08 21:26 UTCGHSA enrichmentGHSA-rwj4-fxr5-gh64 · GitHub severity LOW · GitHub CVSS 3.6
  22. 2026-10-08 16:36 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  23. 2026-10-07 23:41 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  24. 2026-10-06 15:12 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  25. 2026-10-05 17:39 UTCEPSS rescoreEPSS 1.2% · 66th percentile
Show 64 more
  1. 2026-10-04 23:18 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  2. 2026-10-03 14:21 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  3. 2026-09-30 14:59 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  4. 2026-09-30 09:50 UTCEG score recompute
  5. 2026-09-29 10:22 UTCOSV refresh
  6. 2026-09-28 13:45 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  7. 2026-09-27 13:40 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  8. 2026-09-26 15:53 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  9. 2026-09-26 00:19 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  10. 2026-09-24 13:59 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  11. 2026-09-23 13:42 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  12. 2026-09-21 20:27 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  13. 2026-09-20 20:09 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  14. 2026-09-19 15:36 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  15. 2026-09-17 19:22 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  16. 2026-09-15 03:05 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  17. 2026-09-13 16:42 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  18. 2026-09-12 14:56 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  19. 2026-09-11 09:31 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  20. 2026-09-09 18:53 UTCOSV refresh
  21. 2026-09-07 15:56 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  22. 2026-09-05 15:24 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  23. 2026-09-04 13:56 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  24. 2026-09-04 05:02 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  25. 2026-09-02 14:07 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  26. 2026-09-01 03:31 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  27. 2026-08-30 19:13 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  28. 2026-08-28 21:36 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  29. 2026-08-27 14:21 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  30. 2026-08-26 14:41 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  31. 2026-08-25 13:44 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  32. 2026-08-23 00:14 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  33. 2026-08-22 23:37 UTCOSV refresh
  34. 2026-08-21 23:44 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  35. 2026-08-19 16:59 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  36. 2026-08-18 13:43 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  37. 2026-08-16 14:51 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  38. 2026-08-16 02:10 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  39. 2026-08-15 01:26 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  40. 2026-08-12 13:46 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  41. 2026-08-09 13:42 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  42. 2026-08-08 16:32 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  43. 2026-08-07 16:22 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  44. 2026-08-07 02:26 UTCOSV refresh
  45. 2026-08-06 13:42 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  46. 2026-08-05 19:13 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  47. 2026-08-02 02:23 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  48. 2026-08-01 04:12 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  49. 2026-07-30 16:24 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  50. 2026-07-30 01:26 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  51. 2026-07-28 15:32 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  52. 2026-07-26 14:51 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  53. 2026-07-23 14:15 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  54. 2026-07-23 01:31 UTCEG score recompute
  55. 2026-07-22 22:11 UTCEG score recompute
  56. 2026-07-22 14:04 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  57. 2026-07-21 18:18 UTCOSV refresh
  58. 2026-07-21 15:21 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  59. 2026-07-20 17:04 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  60. 2026-07-19 02:26 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  61. 2026-07-18 10:01 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  62. 2026-07-16 16:59 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  63. 2026-07-15 16:54 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  64. 2026-07-15 01:56 UTCEPSS rescoreEPSS 1.3% · 66th percentile

Frequently asked(5)

What is CVE-2018-1000030?
CVE-2018-1000030 is a low-severity vulnerability; its CVE record was published on February 8, 2018. Python 2.7.14 is vulnerable to a Heap-Buffer-Overflow as well as a Heap-Use-After-Free. Python versions prior to 2.7.14 may also be vulnerable and it appears that Python 2.7.17 and prior may also be vulnerable however this has not been confirmed. The vulnerability lies when multiply threads are…
When was CVE-2018-1000030 made public?
CVE-2018-1000030 was made public on September 20, 2017: that is the date its CVE record's CNA, MITRE Corporation, gives for when the vulnerability was made public. The CVE record itself was published on February 8, 2018. EchelonGraph's copy of the record carries a last-modified date of October 8, 2026; the record at its source may have been updated since.
Is CVE-2018-1000030 actively exploited?
CVE-2018-1000030 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.2% probability of exploitation in the next 30 days (67th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2018-1000030?
CVE-2018-1000030 has a CVSS v3 base score of 3.6 (NVD).
How do I remediate CVE-2018-1000030?
A fix for CVE-2018-1000030 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2018-1000030 are linked in the Vendor Advisories panel on this page.

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