CVE-2026-21555

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-03. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

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

In modem, there is a possible improper input validation. This could lead to remote denial of service with no additional execution privileges needed

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
34%
KEV
Not listed

Published

August 3, 2026

Last Modified

August 3, 2026

Advisory Details (1)

Auto-updated Aug 3, 2026
No patch confirmed yet.
generic
https://www.unisoc.com/en/support/product-security-bulletin/2084109408382668801

Vendor Advisories for CVE-2026-21555(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 26× in last 7d / 74× 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. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 20:22 UTCGHSA enrichment
  3. 2026-08-20 07:53 UTCGHSA enrichment
  4. 2026-08-19 19:25 UTCEG score recompute
  5. 2026-08-19 19:25 UTCGHSA enrichment
  6. 2026-08-19 17:03 UTCEPSS rescore
  7. 2026-08-19 06:49 UTCGHSA enrichment
  8. 2026-08-18 18:20 UTCEG score recompute
  9. 2026-08-18 18:20 UTCGHSA enrichment
  10. 2026-08-18 13:48 UTCEPSS rescore
  11. 2026-08-18 03:34 UTCGHSA enrichment
  12. 2026-08-17 14:40 UTCEG score recompute
  13. 2026-08-17 14:40 UTCGHSA enrichment
  14. 2026-08-17 13:47 UTCEPSS rescore
  15. 2026-08-17 02:12 UTCEG score recompute
  16. 2026-08-17 02:12 UTCGHSA enrichment
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 13:43 UTCEG score recompute
  19. 2026-08-16 13:43 UTCGHSA enrichment
  20. 2026-08-16 02:14 UTCEPSS rescore
  21. 2026-08-16 01:14 UTCGHSA enrichment
  22. 2026-08-15 12:45 UTCEG score recompute
  23. 2026-08-15 12:45 UTCGHSA enrichment
  24. 2026-08-15 01:30 UTCEPSS rescore
  25. 2026-08-15 00:13 UTCGHSA enrichment
Show 49 more
  1. 2026-08-14 11:44 UTCGHSA enrichment
  2. 2026-08-13 23:16 UTCEG score recompute
  3. 2026-08-13 23:16 UTCGHSA enrichment
  4. 2026-08-13 22:00 UTCEPSS rescore
  5. 2026-08-13 10:47 UTCGHSA enrichment
  6. 2026-08-12 22:18 UTCEG score recompute
  7. 2026-08-12 22:18 UTCGHSA enrichment
  8. 2026-08-12 13:50 UTCEPSS rescore
  9. 2026-08-12 09:50 UTCGHSA enrichment
  10. 2026-08-11 21:21 UTCEG score recompute
  11. 2026-08-11 21:21 UTCGHSA enrichment
  12. 2026-08-11 13:42 UTCEPSS rescore
  13. 2026-08-11 08:53 UTCEG score recompute
  14. 2026-08-11 08:53 UTCGHSA enrichment
  15. 2026-08-11 00:00 UTCEPSS rescore
  16. 2026-08-10 20:24 UTCGHSA enrichment
  17. 2026-08-10 07:55 UTCGHSA enrichment
  18. 2026-08-09 19:27 UTCEG score recompute
  19. 2026-08-09 19:27 UTCGHSA enrichment
  20. 2026-08-09 13:46 UTCEPSS rescore
  21. 2026-08-09 06:58 UTCGHSA enrichment
  22. 2026-08-08 18:30 UTCEG score recompute
  23. 2026-08-08 18:30 UTCGHSA enrichment
  24. 2026-08-08 16:37 UTCEPSS rescore
  25. 2026-08-08 06:01 UTCGHSA enrichment
  26. 2026-08-07 17:33 UTCEG score recompute
  27. 2026-08-07 17:33 UTCGHSA enrichment
  28. 2026-08-07 05:04 UTCGHSA enrichment
  29. 2026-08-06 16:35 UTCEG score recompute
  30. 2026-08-06 16:35 UTCGHSA enrichment
  31. 2026-08-06 13:46 UTCEPSS rescore
  32. 2026-08-06 04:06 UTCEG score recompute
  33. 2026-08-06 04:06 UTCGHSA enrichment
  34. 2026-08-05 19:17 UTCEPSS rescore
  35. 2026-08-05 15:37 UTCGHSA enrichment
  36. 2026-08-05 03:09 UTCEG score recompute
  37. 2026-08-05 03:08 UTCGHSA enrichment
  38. 2026-08-04 15:10 UTCEPSS rescore
  39. 2026-08-04 14:37 UTCEG score recompute
  40. 2026-08-04 14:37 UTCGHSA enrichment
  41. 2026-08-04 10:38 UTCEPSS rescore
  42. 2026-08-04 02:08 UTCGHSA enrichment
  43. 2026-08-03 13:40 UTCEG score recompute
  44. 2026-08-03 13:39 UTCGHSA enrichment
  45. 2026-08-03 12:41 UTCEG score recompute
  46. 2026-08-03 12:41 UTCGHSA enrichment
  47. 2026-08-03 08:26 UTCEG score recompute
  48. 2026-08-03 07:54 UTCEG score recompute
  49. 2026-08-03 07:53 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-21555?
CVE-2026-21555 is a high vulnerability published on August 3, 2026. In modem, there is a possible improper input validation. This could lead to remote denial of service with no additional execution privileges needed
When was CVE-2026-21555 disclosed?
CVE-2026-21555 was first published in the National Vulnerability Database on August 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-21555 actively exploited?
CVE-2026-21555 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 66.2% of all scored CVEs.
What is the CVSS score of CVE-2026-21555?
CVE-2026-21555 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-21555?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-21555, 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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