CVE-2020-27197

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 2.3% (82nd percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2.3%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

TAXII libtaxii through 1.1.117, as used in EclecticIQ OpenTAXII through 0.2.0 and other products, allows SSRF via an initial http:// substring to the parse method, even when the no_network setting is used for the XML parser. NOTE: the vendor points out that the parse method "wraps the lxml library" and that this may be an issue to "raise ... to the lxml group.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
50
EG Risk 50/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
The EG Score, 9.8 of 10.
Exploitation2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability30% × 15%
EchelonGraph's default: CISA has not published Automatable for this CVE.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from 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 at low or medium mission impact and sooner than that at high.
EPSS PROB
2.3%
EPSS %ILE
82nd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from 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

Published

October 17, 2020

Last Modified

November 21, 2024

Advisory Details (3)

Auto-updated Oct 4, 2026
Patch available.
generic

Blind SSRF in OpenTaxii · Issue #176 · eclecticiq/OpenTAXII · GitHub

https://github.com/eclecticiq/OpenTAXII/issues/176
generic

Blind SSRF vulnerability · Issue #246 · TAXIIProject/libtaxii · GitHub

https://github.com/TAXIIProject/libtaxii/issues/246
generic

Packet Storm

http://packetstormsecurity.com/files/159662/Libtaxii-1.1.117-OpenTaxi-0.2.0-Server-Side-Request-Forgery.html

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
libtaxii1.0.090 ... 1.1.117 (26 versions)
  • every version up to 1.1.118: fixed in 1.1.118
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 26× 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 88 of 148 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. 12 repeat rows among the latest 100 are merged into the row they repeat. The 60 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-10 19:56 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  2. 2026-10-09 20:04 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  3. 2026-10-09 17:25 UTCOSV refresh
  4. 2026-10-08 16:38 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  5. 2026-10-07 23:44 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  6. 2026-10-06 15:13 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  7. 2026-10-05 17:39 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  8. 2026-10-04 23:18 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  9. 2026-10-03 14:22 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  10. 2026-09-30 15:16 UTCEG score recompute
  11. 2026-09-30 14:59 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  12. 2026-09-29 15:14 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  13. 2026-09-27 13:41 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  14. 2026-09-26 15:54 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  15. 2026-09-24 14:00 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  16. 2026-09-22 14:43 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  17. 2026-09-21 20:28 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  18. 2026-09-20 20:11 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  19. 2026-09-20 00:45 UTCOSV refresh
  20. 2026-09-19 15:37 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  21. 2026-09-18 19:23 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  22. 2026-09-17 19:22 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  23. 2026-09-16 14:04 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  24. 2026-09-15 03:06 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  25. 2026-09-13 16:43 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
Show 63 more
  1. 2026-09-12 14:57 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  2. 2026-09-11 09:32 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  3. 2026-09-08 21:56 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  4. 2026-09-07 15:57 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  5. 2026-09-06 13:44 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  6. 2026-09-05 15:24 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  7. 2026-09-04 13:57 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  8. 2026-09-04 05:03 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  9. 2026-09-02 14:08 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  10. 2026-09-01 04:03 UTCOSV refresh
  11. 2026-09-01 03:32 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  12. 2026-08-30 19:14 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  13. 2026-08-30 01:18 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  14. 2026-08-27 14:21 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  15. 2026-08-26 14:42 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  16. 2026-08-25 13:45 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  17. 2026-08-21 23:45 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  18. 2026-08-20 22:52 UTCEPSS rescoreEPSS 2.3% · 82nd percentile
  19. 2026-08-19 17:00 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  20. 2026-08-18 13:44 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  21. 2026-08-17 13:43 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  22. 2026-08-16 14:52 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  23. 2026-08-16 02:11 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  24. 2026-08-15 03:37 UTCOSV refresh
  25. 2026-08-15 01:26 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  26. 2026-08-13 21:57 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  27. 2026-08-12 13:47 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  28. 2026-08-09 13:43 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  29. 2026-08-08 16:33 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  30. 2026-08-07 16:23 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  31. 2026-08-06 13:43 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  32. 2026-08-04 15:06 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  33. 2026-08-04 10:34 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  34. 2026-08-02 02:23 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  35. 2026-08-01 04:12 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  36. 2026-07-30 16:25 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  37. 2026-07-30 15:44 UTCOSV refresh
  38. 2026-07-30 01:27 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  39. 2026-07-28 15:33 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  40. 2026-07-26 14:51 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  41. 2026-07-25 14:15 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  42. 2026-07-24 14:14 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  43. 2026-07-23 14:15 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  44. 2026-07-23 01:52 UTCEG score recompute
  45. 2026-07-22 22:38 UTCEG score recompute
  46. 2026-07-22 14:05 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  47. 2026-07-21 15:22 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  48. 2026-07-20 17:04 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  49. 2026-07-19 14:28 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  50. 2026-07-19 02:26 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  51. 2026-07-16 16:59 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  52. 2026-07-15 16:55 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  53. 2026-07-15 01:57 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  54. 2026-07-13 22:27 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  55. 2026-07-13 06:10 UTCEPSS rescoreEPSS 2.3% · 81st percentile
  56. 2026-07-13 01:07 UTCOSV refresh
  57. 2026-07-12 05:44 UTCEPSS rescoreEPSS 2.2% · 80th percentile
  58. 2026-07-11 08:25 UTCEPSS rescoreEPSS 2.2% · 80th percentile
  59. 2026-07-09 19:07 UTCEPSS rescoreEPSS 2.2% · 80th percentile
  60. 2026-07-08 15:12 UTCEPSS rescoreEPSS 2.2% · 80th percentile
  61. 2026-07-07 13:43 UTCEPSS rescoreEPSS 2.2% · 80th percentile
  62. 2026-07-06 16:25 UTCEPSS rescoreEPSS 2.2% · 80th percentile
  63. 2026-07-06 02:21 UTCEPSS rescoreEPSS 2.2% · 80th percentile

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2020-27197?
CVE-2020-27197 is a critical vulnerability published on October 17, 2020. TAXII libtaxii through 1.1.117, as used in EclecticIQ OpenTAXII through 0.2.0 and other products, allows SSRF via an initial http:// substring to the parse method, even when the no_network setting is used for the XML parser. NOTE: the vendor points out that the parse method "wraps the lxml library"…
When was the CVE record for CVE-2020-27197 published?
The CVE record for CVE-2020-27197 was published on October 17, 2020. 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 November 21, 2024; the record at its source may have been updated since.
Is CVE-2020-27197 actively exploited?
CVE-2020-27197 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.3% probability of exploitation in the next 30 days (82nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2020-27197?
CVE-2020-27197 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2020-27197?
A fix for CVE-2020-27197 is available: update to the fixed version the vendor names in its advisory.

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