CVE-2023-20577

HIGHPre-NVD 7.47.4—
EchelonGraph scoreHIGH confidence

Score 7.4 from GitHub Security Advisory (severity: HIGH) published 2026-09-02. a secondary CVSS source baseline 7.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.4Exploit: None knownExposed: 0

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

A heap overflow in SMM module may allow an attacker with access to a second vulnerability that enables writing to SPI flash, potentially resulting in arbitrary code execution.

CVSS v3
7.4
EG Score
7.4(high)
EG Risk
33(Track)
EG Risk 33/100SSVC: 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
Severity74% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

September 2, 2026

Last Modified

September 4, 2026

References (1)

Vendor Advisories for CVE-2023-20577(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 28× in last 7d / 73× 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.

  1. 2026-09-19 23:16 UTCEG score recompute
  2. 2026-09-19 23:16 UTCGHSA enrichment
  3. 2026-09-19 15:38 UTCEPSS rescore
  4. 2026-09-19 11:55 UTCGHSA enrichment
  5. 2026-09-19 00:34 UTCEG score recompute
  6. 2026-09-19 00:34 UTCGHSA enrichment
  7. 2026-09-18 19:25 UTCEPSS rescore
  8. 2026-09-18 13:14 UTCGHSA enrichment
  9. 2026-09-18 01:53 UTCEG score recompute
  10. 2026-09-18 01:53 UTCGHSA enrichment
  11. 2026-09-17 19:24 UTCEPSS rescore
  12. 2026-09-17 14:33 UTCGHSA enrichment
  13. 2026-09-17 03:12 UTCGHSA enrichment
  14. 2026-09-16 15:51 UTCEG score recompute
  15. 2026-09-16 15:51 UTCGHSA enrichment
  16. 2026-09-16 14:05 UTCEPSS rescore
  17. 2026-09-16 05:11 UTCEPSS rescore
  18. 2026-09-16 04:30 UTCGHSA enrichment
  19. 2026-09-15 17:08 UTCGHSA enrichment
  20. 2026-09-15 05:46 UTCEG score recompute
  21. 2026-09-15 05:45 UTCGHSA enrichment
  22. 2026-09-15 03:07 UTCEPSS rescore
  23. 2026-09-14 18:24 UTCGHSA enrichment
  24. 2026-09-14 06:15 UTCGHSA enrichment
  25. 2026-09-13 18:55 UTCEG score recompute
Show 48 more
  1. 2026-09-13 18:55 UTCGHSA enrichment
  2. 2026-09-13 16:44 UTCEPSS rescore
  3. 2026-09-13 07:33 UTCGHSA enrichment
  4. 2026-09-12 20:13 UTCEG score recompute
  5. 2026-09-12 20:13 UTCGHSA enrichment
  6. 2026-09-12 14:58 UTCEPSS rescore
  7. 2026-09-12 08:52 UTCGHSA enrichment
  8. 2026-09-11 21:31 UTCGHSA enrichment
  9. 2026-09-11 10:10 UTCEG score recompute
  10. 2026-09-11 10:10 UTCGHSA enrichment
  11. 2026-09-11 09:34 UTCEPSS rescore
  12. 2026-09-10 22:46 UTCGHSA enrichment
  13. 2026-09-10 11:25 UTCEG score recompute
  14. 2026-09-10 11:25 UTCGHSA enrichment
  15. 2026-09-09 23:30 UTCGHSA enrichment
  16. 2026-09-09 10:31 UTCGHSA enrichment
  17. 2026-09-08 23:10 UTCEG score recompute
  18. 2026-09-08 23:10 UTCGHSA enrichment
  19. 2026-09-08 21:57 UTCEPSS rescore
  20. 2026-09-08 03:57 UTCGHSA enrichment
  21. 2026-09-07 16:36 UTCEG score recompute
  22. 2026-09-07 16:36 UTCGHSA enrichment
  23. 2026-09-07 15:59 UTCEPSS rescore
  24. 2026-09-07 05:15 UTCGHSA enrichment
  25. 2026-09-06 17:50 UTCEG score recompute
  26. 2026-09-06 17:50 UTCGHSA enrichment
  27. 2026-09-06 13:45 UTCEPSS rescore
  28. 2026-09-06 06:29 UTCGHSA enrichment
  29. 2026-09-05 19:08 UTCEG score recompute
  30. 2026-09-05 19:08 UTCGHSA enrichment
  31. 2026-09-05 15:25 UTCEPSS rescore
  32. 2026-09-05 07:48 UTCGHSA enrichment
  33. 2026-09-04 20:27 UTCEG score recompute
  34. 2026-09-04 20:27 UTCGHSA enrichment
  35. 2026-09-04 20:05 UTCEG score recompute
  36. 2026-09-04 20:05 UTCGHSA enrichment
  37. 2026-09-04 15:37 UTCEG score recompute
  38. 2026-09-04 15:37 UTCGHSA enrichment
  39. 2026-09-04 05:04 UTCEPSS rescore
  40. 2026-09-04 04:16 UTCGHSA enrichment
  41. 2026-09-03 16:54 UTCGHSA enrichment
  42. 2026-09-03 13:05 UTCEG score recompute
  43. 2026-09-03 13:05 UTCGHSA enrichment
  44. 2026-09-03 04:56 UTCEG score recompute
  45. 2026-09-03 04:55 UTCGHSA enrichment
  46. 2026-09-02 20:21 UTCEG score recompute
  47. 2026-09-02 20:01 UTCEG score recompute
  48. 2026-09-02 20:00 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2023-20577?
CVE-2023-20577 is a high vulnerability published on September 2, 2026. A heap overflow in SMM module may allow an attacker with access to a second vulnerability that enables writing to SPI flash, potentially resulting in arbitrary code execution.
When was CVE-2023-20577 disclosed?
CVE-2023-20577 was first published in the National Vulnerability Database on September 2, 2026, with the most recent update on September 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-20577 actively exploited?
CVE-2023-20577 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 94.4% of all scored CVEs.
What is the CVSS score of CVE-2023-20577?
CVE-2023-20577 has a CVSS v3 base score of 7.4 (NVD).
How do I remediate CVE-2023-20577?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-20577, 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.

Dependency Blast Radius

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