CVE-2026-20156

CRITICALNVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.5% (38th percentile of EPSS-scored CVEs). GitHub Security Advisory CVSS 8.1 is lower than this score; a lower GitHub score revises it only when its advisory is newer than the CVE record's last change, and this advisory (published 2026-07-15) is not newer than that change (2026-08-14), so it does not.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 9.8Exploit: None knownExposed services: Not assessed

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

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
9.8CRITICALmedium confidence
EG Risk
44
EG Risk 44/100

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 (value × EchelonGraph’s weight)
Severity98% × 45%
The EG Score, 9.8 of 10.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.5%
EPSS %ILE
38th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 15, 2026

Last Modified

August 14, 2026

Advisory Details (2)

Auto-updated Oct 9, 2026
No fix on record yet.
Web page
https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification
Web page

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 16× in last 7d / 46× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 294 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 194 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-14 09:59 UTCEG score recompute
  2. 2026-10-14 09:58 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  3. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  4. 2026-10-13 08:02 UTCEG score recompute
  5. 2026-10-13 08:02 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  6. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  7. 2026-10-12 16:24 UTCEG score recompute
  8. 2026-10-12 09:24 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  9. 2026-10-11 20:06 UTCEG score recompute
  10. 2026-10-11 17:19 UTCEG score recompute
  11. 2026-10-11 14:51 UTCEG score recompute
  12. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  13. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  14. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  15. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  16. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  17. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  18. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  19. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  20. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  21. 2026-10-01 12:40 UTCEG score recompute
  22. 2026-10-01 12:40 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  23. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  24. 2026-09-29 15:21 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  25. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 37th percentile
Show 75 more
  1. 2026-09-28 13:14 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  2. 2026-09-28 08:45 UTCEG score recompute
  3. 2026-09-28 08:45 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  4. 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  5. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  6. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  7. 2026-09-24 14:03 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  8. 2026-09-24 13:17 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  9. 2026-09-24 08:50 UTCEG score recompute
  10. 2026-09-24 08:50 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  11. 2026-09-23 11:39 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  12. 2026-09-23 07:27 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  13. 2026-09-23 03:16 UTCEG score recompute
  14. 2026-09-23 03:16 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  15. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  16. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  17. 2026-09-18 09:59 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  18. 2026-09-18 04:45 UTCEG score recompute
  19. 2026-09-18 04:45 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  20. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  21. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  22. 2026-09-14 11:42 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  23. 2026-09-14 07:32 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  24. 2026-09-14 03:22 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  25. 2026-09-13 23:12 UTCEG score recompute
  26. 2026-09-13 23:12 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  27. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  28. 2026-09-13 16:25 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  29. 2026-09-13 11:49 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  30. 2026-09-13 07:13 UTCEG score recompute
  31. 2026-09-13 07:13 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  32. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  33. 2026-09-12 13:02 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  34. 2026-09-12 07:26 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  35. 2026-09-12 01:56 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  36. 2026-09-11 21:46 UTCEG score recompute
  37. 2026-09-11 21:46 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  38. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  39. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  40. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  41. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  42. 2026-09-08 00:51 UTCEG score recompute
  43. 2026-09-08 00:51 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  44. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  45. 2026-09-06 17:44 UTCEG score recompute
  46. 2026-09-06 17:44 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  47. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  48. 2026-09-06 13:28 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  49. 2026-09-06 01:30 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  50. 2026-09-05 20:50 UTCEG score recompute
  51. 2026-09-05 20:50 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  52. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  53. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  54. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  55. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  56. 2026-08-31 05:40 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  57. 2026-08-31 01:29 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  58. 2026-08-30 21:19 UTCEG score recompute
  59. 2026-08-30 21:19 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  60. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  61. 2026-08-30 17:09 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  62. 2026-08-30 12:59 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  63. 2026-08-30 08:04 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  64. 2026-08-30 03:52 UTCEG score recompute
  65. 2026-08-30 03:51 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  66. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  67. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  68. 2026-08-28 01:52 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  69. 2026-08-27 21:28 UTCEG score recompute
  70. 2026-08-27 21:28 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  71. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  72. 2026-08-27 12:40 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  73. 2026-08-27 03:20 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1
  74. 2026-08-26 23:07 UTCEG score recompute
  75. 2026-08-26 23:07 UTCGHSA enrichmentGHSA-gxwc-c8rv-5m26 · GitHub severity HIGH · GitHub CVSS 8.1

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-20156?
CVE-2026-20156 is a critical-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-20156 published?
The CVE record for CVE-2026-20156 was published on July 15, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of August 14, 2026; the record at its source may have been updated since.
Is CVE-2026-20156 actively exploited?
CVE-2026-20156 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (38th percentile of EPSS-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?
No fix for CVE-2026-20156 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-20156 are linked in the Vendor Advisories panel on this page.

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