CVE-2026-20124

HIGHPre-NVD 7.77.7—
EchelonGraph scoreMEDIUM 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(medium)
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
29%
KEV
Not listed

Published

August 5, 2026

Last Modified

September 17, 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 25× in last 7d / 103× 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 166 total refreshes for this CVE.

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

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 September 17, 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 71.0% 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

Explore the affected products and dependency analysis for CVE-2026-20124

Explore →

Is Your Infrastructure Affected by CVE-2026-20124?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs