CVE-2023-20540

LOWPre-NVD 1.81.8—
EchelonGraph scoreMEDIUM confidence

This low-severity CVE scores 1.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1%, top 98% 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, secondary
Trending — 3 sources updated this week
1.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 1.8Exploit: None knownExposed: 0

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

An observable timing discrepancy in the ASP could allow a privileged attacker to perform a brute-force attack against the hash message authentication code, allowing arbitrary message input, potentially leading to a loss of data integrity.

CVSS v3
1.8
EG Score
1.8(medium)
EG Risk
13(Track)
EG Risk 13/100SSVC: 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
Severity18% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

June 26, 2026

Last Modified

June 26, 2026

References (1)

Vendor Advisories for CVE-2023-20540(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 10× in last 7d / 45× 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. 2026-08-25 13:46 UTCEPSS rescore
  2. 2026-08-24 14:14 UTCEPSS rescore
  3. 2026-08-23 08:33 UTCEG score recompute
  4. 2026-08-23 08:33 UTCGHSA enrichment
  5. 2026-08-23 00:17 UTCEPSS rescore
  6. 2026-08-21 23:46 UTCEPSS rescore
  7. 2026-08-20 22:53 UTCEPSS rescore
  8. 2026-08-20 06:51 UTCEG score recompute
  9. 2026-08-20 06:51 UTCGHSA enrichment
  10. 2026-08-19 17:01 UTCEPSS rescore
  11. 2026-08-18 13:46 UTCEPSS rescore
  12. 2026-08-17 13:44 UTCEPSS rescore
  13. 2026-08-17 00:21 UTCEG score recompute
  14. 2026-08-17 00:21 UTCGHSA enrichment
  15. 2026-08-16 14:53 UTCEPSS rescore
  16. 2026-08-16 02:12 UTCEPSS rescore
  17. 2026-08-15 01:28 UTCEPSS rescore
  18. 2026-08-15 01:27 UTCEPSS rescore
  19. 2026-08-13 22:57 UTCEG score recompute
  20. 2026-08-13 22:57 UTCGHSA enrichment
  21. 2026-08-13 21:58 UTCEPSS rescore
  22. 2026-08-12 13:48 UTCEPSS rescore
  23. 2026-08-10 21:34 UTCEG score recompute
  24. 2026-08-10 21:34 UTCGHSA enrichment
  25. 2026-08-09 13:44 UTCEPSS rescore
Show 75 more
  1. 2026-08-08 16:34 UTCEPSS rescore
  2. 2026-08-07 20:09 UTCEG score recompute
  3. 2026-08-07 20:09 UTCGHSA enrichment
  4. 2026-08-06 13:44 UTCEPSS rescore
  5. 2026-08-05 19:15 UTCEPSS rescore
  6. 2026-08-04 18:46 UTCEG score recompute
  7. 2026-08-04 18:46 UTCGHSA enrichment
  8. 2026-08-04 15:07 UTCEPSS rescore
  9. 2026-08-03 10:34 UTCEPSS rescore
  10. 2026-08-02 02:24 UTCEPSS rescore
  11. 2026-08-02 02:24 UTCEPSS rescore
  12. 2026-08-01 17:22 UTCEG score recompute
  13. 2026-08-01 17:22 UTCGHSA enrichment
  14. 2026-08-01 04:13 UTCEPSS rescore
  15. 2026-07-30 16:26 UTCEPSS rescore
  16. 2026-07-30 01:28 UTCEPSS rescore
  17. 2026-07-30 01:28 UTCEPSS rescore
  18. 2026-07-29 15:58 UTCEG score recompute
  19. 2026-07-29 15:58 UTCGHSA enrichment
  20. 2026-07-28 15:34 UTCEPSS rescore
  21. 2026-07-26 14:52 UTCEPSS rescore
  22. 2026-07-26 14:52 UTCEPSS rescore
  23. 2026-07-26 14:34 UTCEG score recompute
  24. 2026-07-26 14:34 UTCGHSA enrichment
  25. 2026-07-25 14:16 UTCEPSS rescore
  26. 2026-07-25 14:16 UTCEPSS rescore
  27. 2026-07-24 14:15 UTCEPSS rescore
  28. 2026-07-23 14:16 UTCEPSS rescore
  29. 2026-07-23 14:16 UTCEPSS rescore
  30. 2026-07-23 02:18 UTCEG score recompute
  31. 2026-07-22 23:05 UTCEG score recompute
  32. 2026-07-22 14:06 UTCEPSS rescore
  33. 2026-07-21 15:23 UTCEPSS rescore
  34. 2026-07-20 17:05 UTCEPSS rescore
  35. 2026-07-19 14:29 UTCEPSS rescore
  36. 2026-07-19 14:29 UTCEPSS rescore
  37. 2026-07-19 02:27 UTCEPSS rescore
  38. 2026-07-19 02:27 UTCEPSS rescore
  39. 2026-07-18 10:03 UTCEPSS rescore
  40. 2026-07-18 10:03 UTCEPSS rescore
  41. 2026-07-16 17:01 UTCEPSS rescore
  42. 2026-07-16 17:01 UTCEPSS rescore
  43. 2026-07-15 16:56 UTCEPSS rescore
  44. 2026-07-15 02:12 UTCGHSA enrichment
  45. 2026-07-15 01:58 UTCEPSS rescore
  46. 2026-07-15 01:58 UTCEPSS rescore
  47. 2026-07-13 22:28 UTCEPSS rescore
  48. 2026-07-13 22:28 UTCEPSS rescore
  49. 2026-07-13 06:11 UTCEPSS rescore
  50. 2026-07-12 05:45 UTCEPSS rescore
  51. 2026-07-12 05:45 UTCEPSS rescore
  52. 2026-07-12 00:45 UTCGHSA enrichment
  53. 2026-07-11 08:25 UTCEPSS rescore
  54. 2026-07-11 08:25 UTCEPSS rescore
  55. 2026-07-09 19:08 UTCEPSS rescore
  56. 2026-07-08 23:21 UTCGHSA enrichment
  57. 2026-07-08 15:13 UTCEPSS rescore
  58. 2026-07-07 13:44 UTCEPSS rescore
  59. 2026-07-06 16:26 UTCEPSS rescore
  60. 2026-07-06 16:25 UTCEPSS rescore
  61. 2026-07-06 02:21 UTCEPSS rescore
  62. 2026-07-05 21:53 UTCGHSA enrichment
  63. 2026-07-05 02:28 UTCEPSS rescore
  64. 2026-07-04 06:29 UTCEPSS rescore
  65. 2026-07-04 06:29 UTCEPSS rescore
  66. 2026-07-02 20:29 UTCGHSA enrichment
  67. 2026-07-02 16:58 UTCEPSS rescore
  68. 2026-06-30 23:21 UTCEPSS rescore
  69. 2026-06-29 19:05 UTCGHSA enrichment
  70. 2026-06-28 14:06 UTCEPSS rescore
  71. 2026-06-28 14:06 UTCEPSS rescore
  72. 2026-06-28 04:54 UTCEPSS rescore
  73. 2026-06-28 04:54 UTCEPSS rescore
  74. 2026-06-26 17:41 UTCEG score recompute
  75. 2026-06-26 17:41 UTCNVD updatefirst tracked

Frequently asked(5)

What is CVE-2023-20540?
CVE-2023-20540 is a low vulnerability published on June 26, 2026. An observable timing discrepancy in the ASP could allow a privileged attacker to perform a brute-force attack against the hash message authentication code, allowing arbitrary message input, potentially leading to a loss of data integrity.
When was CVE-2023-20540 disclosed?
CVE-2023-20540 was first published in the National Vulnerability Database on June 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-20540 actively exploited?
CVE-2023-20540 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 95.3% of all scored CVEs.
What is the CVSS score of CVE-2023-20540?
CVE-2023-20540 has a CVSS v3 base score of 1.8 (NVD).
How do I remediate CVE-2023-20540?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-20540, 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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