CVE-2021-22897

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2022-05-24. NVD baseline CVSS 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 3.0%CVSS: 5.3Exploit: Elevated riskExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

curl 7.61.0 through 7.76.1 suffers from exposure of data element to wrong session due to a mistake in the code for CURLOPT_SSL_CIPHER_LIST when libcurl is built to use the Schannel TLS library. The selected cipher set was stored in a single "static" variable in the library, which has the surprising side-effect that if an application sets up multiple concurrent transfers, the last one that sets the ciphers will accidentally control the set used by all transfers. In a worst-case scenario, this weakens transport security significantly.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
55
EG Risk 55/100CISA SSVC

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
Severity53% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low or medium mission impact and sooner than that at high; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
EPSS PROB
3.0%
EPSS %ILE
86th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low or medium mission impact and sooner than that at high; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

June 11, 2021

Last Modified

May 28, 2026

References (17)

Vendor Advisories for CVE-2021-22897(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 32× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 179 total refreshes for this CVE.

  1. 2026-10-09 20:04 UTCEPSS rescore
  2. 2026-10-08 16:39 UTCEPSS rescore
  3. 2026-10-07 23:44 UTCEPSS rescore
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  10. 2026-09-30 15:30 UTCEG score recompute
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  1. 2026-09-16 14:05 UTCEPSS rescore
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  9. 2026-09-07 15:58 UTCEPSS rescore
  10. 2026-09-06 15:31 UTCOSV refresh
  11. 2026-09-06 13:44 UTCEPSS rescore
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  21. 2026-08-28 21:37 UTCEPSS rescore
  22. 2026-08-27 14:22 UTCEPSS rescore
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  24. 2026-08-25 13:45 UTCEPSS rescore
  25. 2026-08-23 00:16 UTCEPSS rescore
  26. 2026-08-21 23:46 UTCEPSS rescore
  27. 2026-08-20 22:52 UTCEPSS rescore
  28. 2026-08-20 01:34 UTCOSV refresh
  29. 2026-08-19 17:01 UTCEPSS rescore
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  41. 2026-08-05 19:14 UTCEPSS rescore
  42. 2026-08-04 20:27 UTCOSV refresh
  43. 2026-08-04 15:06 UTCEPSS rescore
  44. 2026-08-04 10:34 UTCEPSS rescore
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  54. 2026-07-23 14:15 UTCEPSS rescore
  55. 2026-07-23 01:57 UTCEG score recompute
  56. 2026-07-22 22:44 UTCEG score recompute
  57. 2026-07-22 14:05 UTCEPSS rescore
  58. 2026-07-21 15:22 UTCEPSS rescore
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  60. 2026-07-20 17:04 UTCEPSS rescore
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  63. 2026-07-18 18:59 UTCOSV refresh
  64. 2026-07-18 10:02 UTCEPSS rescore
  65. 2026-07-16 17:00 UTCEPSS rescore
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  75. 2026-07-11 08:25 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2021-22897?
CVE-2021-22897 is a medium vulnerability published on June 11, 2021. curl 7.61.0 through 7.76.1 suffers from exposure of data element to wrong session due to a mistake in the code for CURLOPTSSLCIPHER_LIST when libcurl is built to use the Schannel TLS library. The selected cipher set was stored in a single "static" variable in the library, which has the surprising…
When was CVE-2021-22897 disclosed?
CVE-2021-22897 was first published on June 11, 2021, with the most recent update on May 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-22897 actively exploited?
CVE-2021-22897 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.0% probability of exploitation in the next 30 days (86th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2021-22897?
CVE-2021-22897 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2021-22897?
A fix for CVE-2021-22897 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation. The vendor advisories EchelonGraph has for CVE-2021-22897 are linked in the Vendor Advisories panel on this page.

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