CVE-2026-20156
Buffer overflow hardening fixes in Cisco RoomOS may prevent memory corruption exploitable remotely.
Is CVE-2026-20156 being exploited?
Not confirmed. CVE-2026-20156 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.26% probability of exploitation in the next 30 days.
How severe is CVE-2026-20156?
CVE-2026-20156 is rated High with a CVSS score of 8.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-20156?
Yes. A fix has been recorded for CVE-2026-20156. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-20156 affect?
CVE-2026-20156 affects Cisco RoomOS, Cisco video endpoints, Cisco collaboration devices. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-20156?
Apply Cisco RoomOS update immediately; isolate affected devices until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Crafted input can trigger buffer overflows allowing arbitrary code execution, device compromise, or denial of service.
Patch when possible
- affectedRoomOS 10.11.2.2
- affectedRoomOS 10.15.2.2
- affectedRoomOS 11.5.4.6
- affectedRoomOS 11.5.2.4
- affectedRoomOS 10.8.2.5
- affectedRoomOS 10.11.5.2
- affectedRoomOS 10.11.3.0
- affectedRoomOS 10.15.5.3
- affectedRoomOS 10.19.2.2
- affectedRoomOS 11.1.3.1
- affectedRoomOS 10.11.6.0
- affectedRoomOS 10.19.3.0
- affectedRoomOS 10.19.4.2
- affectedRoomOS 10.3.2.4
- affectedRoomOS 10.3.4.0
- affectedRoomOS 10.15.3.0
- affectedRoomOS 11.1.4.1
- affectedRoomOS 11.14.2.3
- affectedRoomOS 11.1.2.4
- affectedRoomOS 10.8.3.1
- affectedRoomOS 11.14.2.1
- affectedRoomOS 10.3.3.0
- affectedRoomOS 10.8.4.0
- affectedRoomOS 10.15.4.1
- affectedRoomOS 10.19.5.6
- affectedRoomOS 10.11.4.1
- affectedRoomOS 11.9.3.1
- affectedRoomOS 11.5.3.3
- affectedRoomOS 10.3.2.0
- affectedRoomOS 11.9.2.4
- affectedRoomOS 11.14.3.0
- affectedRoomOS 11.17.2.2
- affectedRoomOS 11.14.4.0
- affectedRoomOS 10.19 StepUpg
- affectedRoomOS 11.17.3.0
- affectedRoomOS 11.20.2.3
- affectedRoomOS 11.14.5.0
- affectedRoomOS 11.17.4.0
- affectedRoomOS 11.20.3.0
- affectedRoomOS 11.23.1.6
- affectedRoomOS 11.23.1.8
- affectedRoomOS 11.24.1.5
- affectedRoomOS 11.24.2.4
- affectedRoomOS 11.24.3.0
- affectedRoomOS 11.24.4.1
- affectedRoomOS 11.27.2.0
- affectedRoomOS 11.28.1.3
- affectedRoomOS 11.27.3.0
- affectedRoomOS 11.31.1.5
- affectedRoomOS 11.27.4.0
- affectedRoomOS 11.32.2.1
- affectedRoomOS 11.33.1.7
- affectedRoomOS 26.0.1.2
- affectedRoomOS 11.34.1.2
- affectedRoomOS 11.32.3.0
- affectedRoomOS 11.27.5.0
- affectedRoomOS 11.32.4.0
- affectedRoomOS 26.1.1.5
- affectedRoomOS 11.35.1.2
- affectedRoomOS 26.2.2.2
- affectedRoomOS 11.32.5.1
- affectedRoomOS 26.4.1.6
- affectedRoomOS 26.4.1.4
- affectedRoomOS 26.3.1.3
- affectedRoomOS 11.36.1.1
- affectedRoomOS 11.37.1.0
- affectedRoomOS 26.5.2.0
- affectedRoomOS 11.38.1.1
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.