CVE-2026-20156

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 83% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco RoomOS engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20156 are related to improper restriction of operations within the bounds of a memory buffer that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-119.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
17%
KEV
Not listed

Published

July 15, 2026

Last Modified

August 14, 2026

Advisory Details (2)

Auto-updated Aug 28, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic
https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification
generic🔴 Active Exploitation

Cisco RoomOS Security Hardening Release: July 2026

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-roomos-AqNMbEq

Vendor Advisories for CVE-2026-20156(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 34× in last 7d / 164× 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 207 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-20156?
CVE-2026-20156 is a critical vulnerability published on July 15, 2026. As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco RoomOS engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities. The…
When was CVE-2026-20156 disclosed?
CVE-2026-20156 was first published in the National Vulnerability Database on July 15, 2026, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20156 actively exploited?
CVE-2026-20156 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 83.1% of all scored CVEs.
What is the CVSS score of CVE-2026-20156?
CVE-2026-20156 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-20156?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20156, 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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