CVE-2026-20124

HIGHPre-NVD 7.77.7—
EchelonGraph scoreHIGH confidence

Score 7.7 from GitHub Security Advisory (severity: HIGH) published 2026-08-05. a secondary CVSS source baseline 7.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.7Exploit: None knownExposed: 0

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

A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS XE Software could allow an authenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. This vulnerability is due to improper error handling when parsing SNMP requests. This vulnerability affects all versions of SNMP — Versions 1, 2c, and 3. An attacker could exploit this vulnerability by sending a malformed SNMP request to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly. The attacker must have the SNMPv1 or v2c read-only or read-write community string or valid SNMPv3 user credentials on the affected device.

CVSS v3
7.7
EG Score
7.7(high)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity77% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
28%
KEV
Not listed

Published

August 5, 2026

Last Modified

August 6, 2026

Advisory Details (1)

Auto-updated Aug 5, 2026
No patch confirmed yet.
generic

Cisco IOS XE Software SNMP Denial of Service Vulnerability

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-snmp-dos-ZAqNm4MD

Vendor Advisories for CVE-2026-20124(2)

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 / 66× 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. 2026-08-21 01:49 UTCEG score recompute
  2. 2026-08-21 01:49 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 14:20 UTCGHSA enrichment
  5. 2026-08-20 02:09 UTCEG score recompute
  6. 2026-08-20 02:09 UTCGHSA enrichment
  7. 2026-08-19 17:03 UTCEPSS rescore
  8. 2026-08-19 14:41 UTCGHSA enrichment
  9. 2026-08-19 03:14 UTCGHSA enrichment
  10. 2026-08-18 15:44 UTCEG score recompute
  11. 2026-08-18 15:44 UTCGHSA enrichment
  12. 2026-08-18 13:48 UTCEPSS rescore
  13. 2026-08-18 02:33 UTCGHSA enrichment
  14. 2026-08-17 15:07 UTCEG score recompute
  15. 2026-08-17 15:07 UTCGHSA enrichment
  16. 2026-08-17 13:47 UTCEPSS rescore
  17. 2026-08-17 03:41 UTCGHSA enrichment
  18. 2026-08-16 16:14 UTCEG score recompute
  19. 2026-08-16 16:14 UTCGHSA enrichment
  20. 2026-08-16 14:56 UTCEPSS rescore
  21. 2026-08-16 04:48 UTCEG score recompute
  22. 2026-08-16 04:48 UTCGHSA enrichment
  23. 2026-08-16 02:14 UTCEPSS rescore
  24. 2026-08-15 17:22 UTCGHSA enrichment
  25. 2026-08-15 05:56 UTCEG score recompute
Show 41 more
  1. 2026-08-15 05:56 UTCGHSA enrichment
  2. 2026-08-15 01:30 UTCEPSS rescore
  3. 2026-08-14 18:29 UTCGHSA enrichment
  4. 2026-08-14 07:03 UTCEG score recompute
  5. 2026-08-14 07:03 UTCGHSA enrichment
  6. 2026-08-13 22:00 UTCEPSS rescore
  7. 2026-08-13 19:37 UTCGHSA enrichment
  8. 2026-08-13 08:11 UTCGHSA enrichment
  9. 2026-08-12 20:45 UTCEG score recompute
  10. 2026-08-12 20:45 UTCGHSA enrichment
  11. 2026-08-12 13:50 UTCEPSS rescore
  12. 2026-08-12 09:19 UTCGHSA enrichment
  13. 2026-08-11 21:52 UTCEG score recompute
  14. 2026-08-11 21:52 UTCGHSA enrichment
  15. 2026-08-11 13:42 UTCEPSS rescore
  16. 2026-08-11 10:26 UTCEG score recompute
  17. 2026-08-11 10:26 UTCGHSA enrichment
  18. 2026-08-11 00:00 UTCEPSS rescore
  19. 2026-08-10 23:00 UTCGHSA enrichment
  20. 2026-08-10 11:33 UTCGHSA enrichment
  21. 2026-08-10 00:07 UTCEG score recompute
  22. 2026-08-10 00:07 UTCGHSA enrichment
  23. 2026-08-09 13:46 UTCEPSS rescore
  24. 2026-08-09 12:42 UTCGHSA enrichment
  25. 2026-08-09 01:16 UTCEG score recompute
  26. 2026-08-09 01:16 UTCGHSA enrichment
  27. 2026-08-08 16:37 UTCEPSS rescore
  28. 2026-08-08 13:50 UTCGHSA enrichment
  29. 2026-08-08 02:23 UTCEG score recompute
  30. 2026-08-08 02:23 UTCGHSA enrichment
  31. 2026-08-07 14:57 UTCGHSA enrichment
  32. 2026-08-07 03:31 UTCGHSA enrichment
  33. 2026-08-06 16:05 UTCEG score recompute
  34. 2026-08-06 16:05 UTCGHSA enrichment
  35. 2026-08-06 13:46 UTCEPSS rescore
  36. 2026-08-06 05:57 UTCGHSA enrichment
  37. 2026-08-05 18:31 UTCEG score recompute
  38. 2026-08-05 18:31 UTCGHSA enrichment
  39. 2026-08-05 17:30 UTCEG score recompute
  40. 2026-08-05 16:52 UTCEG score recompute
  41. 2026-08-05 16:50 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-20124?
CVE-2026-20124 is a high vulnerability published on August 5, 2026. A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS XE Software could allow an authenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. This vulnerability is due to improper error handling when…
When was CVE-2026-20124 disclosed?
CVE-2026-20124 was first published in the National Vulnerability Database on August 5, 2026, with the most recent update on August 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20124 actively exploited?
CVE-2026-20124 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 72.3% of all scored CVEs.
What is the CVSS score of CVE-2026-20124?
CVE-2026-20124 has a CVSS v3 base score of 7.7 (NVD).
How do I remediate CVE-2026-20124?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20124, 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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