CVE-2020-36177

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 3.5%, top 12% of all CVEs by exploit prediction. 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 fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 4%CVSS: 9.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

RsaPad_PSS in wolfcrypt/src/rsa.c in wolfSSL before 4.6.0 has an out-of-bounds write for certain relationships between key size and digest size.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: Track

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
Severity98% × 45%
Exploitation4% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
4%
EPSS %ILE
88%
KEV
Not listed

Published

January 6, 2021

Last Modified

November 21, 2024

Advisory Details (5)

Auto-updated Aug 15, 2026
Patch available. Sources: github_pr, github_release, github_commit.
github_release Patch Available

wolfSSL release version 4.6.0

Patch available: wolfSSL/wolfssl v4.6.0-stable

https://github.com/wolfSSL/wolfssl/releases/tag/v4.6.0-stable
github_pr

RSA-PSS: Handle edge case with encoding message to hash

Fix merged in wolfSSL/wolfssl PR #3426 on 2020-11-03 — awaiting tagged release

https://github.com/wolfSSL/wolfssl/pull/3426
github_commit

commit fb2288c46dd4 (wolfSSL/wolfssl)

Fix landed in wolfSSL/wolfssl commit fb2288c46dd4 — awaiting tagged release

https://github.com/wolfSSL/wolfssl/commit/fb2288c46dd4c864b78f00a47a364b96a09a5c0f
github_commit

commit 63bf5dc56ccb (wolfSSL/wolfssl)

Fix landed in wolfSSL/wolfssl commit 63bf5dc56ccb — awaiting tagged release

https://github.com/wolfSSL/wolfssl/commit/63bf5dc56ccbfc12a73b06327361687091a4c6f7
generic
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26567

Affected Packages

(3 across 3 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
wolfssl—4.6.0-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
wolfssl—4.6.0-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
wolfssl—4.6.0-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 29× 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 120 total refreshes for this CVE.

  1. 2026-08-20 22:52 UTCEPSS rescore
  2. 2026-08-20 11:01 UTCOSV refresh
  3. 2026-08-19 17:00 UTCEPSS rescore
  4. 2026-08-18 13:44 UTCEPSS rescore
  5. 2026-08-17 13:43 UTCEPSS rescore
  6. 2026-08-16 14:52 UTCEPSS rescore
  7. 2026-08-16 02:11 UTCEPSS rescore
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  9. 2026-08-13 21:57 UTCEPSS rescore
  10. 2026-08-12 13:47 UTCEPSS rescore
  11. 2026-08-09 13:43 UTCEPSS rescore
  12. 2026-08-08 16:33 UTCEPSS rescore
  13. 2026-08-07 16:23 UTCEPSS rescore
  14. 2026-08-06 13:43 UTCEPSS rescore
  15. 2026-08-05 06:11 UTCOSV refresh
  16. 2026-08-04 15:06 UTCEPSS rescore
  17. 2026-08-04 10:34 UTCEPSS rescore
  18. 2026-08-02 02:23 UTCEPSS rescore
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  20. 2026-07-30 16:25 UTCEPSS rescore
  21. 2026-07-30 01:27 UTCEPSS rescore
  22. 2026-07-28 15:33 UTCEPSS rescore
  23. 2026-07-26 14:51 UTCEPSS rescore
  24. 2026-07-25 14:15 UTCEPSS rescore
  25. 2026-07-24 14:14 UTCEPSS rescore
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  1. 2026-07-23 14:15 UTCEPSS rescore
  2. 2026-07-23 14:15 UTCEPSS rescore
  3. 2026-07-23 01:53 UTCEG score recompute
  4. 2026-07-22 22:39 UTCEG score recompute
  5. 2026-07-22 14:05 UTCEPSS rescore
  6. 2026-07-21 15:22 UTCEPSS rescore
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  8. 2026-07-20 17:04 UTCEPSS rescore
  9. 2026-07-20 17:04 UTCEPSS rescore
  10. 2026-07-19 14:28 UTCEPSS rescore
  11. 2026-07-19 14:28 UTCEPSS rescore
  12. 2026-07-19 04:22 UTCOSV refresh
  13. 2026-07-19 02:26 UTCEPSS rescore
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  15. 2026-07-16 16:59 UTCEPSS rescore
  16. 2026-07-15 16:55 UTCEPSS rescore
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  18. 2026-07-15 01:57 UTCEPSS rescore
  19. 2026-07-13 22:27 UTCEPSS rescore
  20. 2026-07-13 22:27 UTCEPSS rescore
  21. 2026-07-13 06:10 UTCEPSS rescore
  22. 2026-07-13 06:10 UTCEPSS rescore
  23. 2026-07-12 05:44 UTCEPSS rescore
  24. 2026-07-11 08:25 UTCEPSS rescore
  25. 2026-07-11 08:25 UTCEPSS rescore
  26. 2026-07-09 19:07 UTCEPSS rescore
  27. 2026-07-08 15:12 UTCEPSS rescore
  28. 2026-07-06 16:25 UTCEPSS rescore
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  30. 2026-07-06 02:21 UTCEPSS rescore
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  32. 2026-07-04 06:29 UTCEPSS rescore
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  34. 2026-07-01 11:18 UTCOSV refresh
  35. 2026-06-30 23:20 UTCEPSS rescore
  36. 2026-06-30 23:20 UTCEPSS rescore
  37. 2026-06-29 14:04 UTCEPSS rescore
  38. 2026-06-28 04:54 UTCEPSS rescore
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  40. 2026-06-27 03:06 UTCEPSS rescore
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  42. 2026-06-25 13:48 UTCEPSS rescore
  43. 2026-06-24 14:03 UTCEPSS rescore
  44. 2026-06-24 14:03 UTCEPSS rescore
  45. 2026-06-23 21:31 UTCEPSS rescore
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  47. 2026-06-22 14:23 UTCEPSS rescore
  48. 2026-06-22 14:23 UTCEPSS rescore
  49. 2026-06-21 14:54 UTCEPSS rescore
  50. 2026-06-21 14:54 UTCEPSS rescore
  51. 2026-06-21 01:57 UTCEPSS rescore
  52. 2026-06-19 19:24 UTCEPSS rescore
  53. 2026-06-19 19:23 UTCEPSS rescore
  54. 2026-06-18 17:50 UTCEPSS rescore
  55. 2026-06-18 17:50 UTCEPSS rescore
  56. 2026-06-17 17:50 UTCEPSS rescore
  57. 2026-06-16 17:50 UTCEPSS rescore
  58. 2026-06-15 17:46 UTCEPSS rescore
  59. 2026-06-14 23:15 UTCEPSS rescore
  60. 2026-06-13 22:58 UTCEPSS rescore
  61. 2026-06-13 17:43 UTCOSV refresh
  62. 2026-06-12 23:10 UTCEPSS rescore
  63. 2026-06-11 13:58 UTCEPSS rescore
  64. 2026-06-10 22:16 UTCEPSS rescore
  65. 2026-06-10 13:20 UTCEPSS rescore
  66. 2026-06-08 14:15 UTCEPSS rescore
  67. 2026-06-07 15:23 UTCEPSS rescore
  68. 2026-06-07 15:23 UTCEPSS rescore
  69. 2026-06-07 15:23 UTCEPSS rescore
  70. 2026-06-06 13:46 UTCEPSS rescore
  71. 2026-06-06 13:45 UTCEPSS rescore
  72. 2026-06-05 22:45 UTCEPSS rescore
  73. 2026-06-05 22:45 UTCEPSS rescore
  74. 2026-06-05 06:08 UTCEPSS rescore
  75. 2026-06-05 06:08 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2020-36177?
CVE-2020-36177 is a critical vulnerability published on January 6, 2021. RsaPad_PSS in wolfcrypt/src/rsa.c in wolfSSL before 4.6.0 has an out-of-bounds write for certain relationships between key size and digest size.
When was CVE-2020-36177 disclosed?
CVE-2020-36177 was first published in the National Vulnerability Database on January 6, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-36177 actively exploited?
CVE-2020-36177 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4% probability of exploitation in the next 30 days, which ranks it in the top 11.7% of all scored CVEs.
What is the CVSS score of CVE-2020-36177?
CVE-2020-36177 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2020-36177?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-36177, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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