High Input validation

CVE-2026-20153 — Cisco RoomOS Security Hardening Release - Input Validation Vulnerabilities

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-2026-20153 are related to improper input validation that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-20.

Published Jul 15, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: cisco

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

Technical severity (high)+6
Automatable exploitation (SSVC)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

—

No EPSS score.

Affects

Cisco

Cisco RoomOS Software and 2 more

CVSS base

7.5

High · 2 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

None

none · proof-of-concept · active

Automatable

Yes

can an attacker script the kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Cisco Cisco RoomOS Software, Cisco Roomos, Cisco Roomos Cloud).
The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes matching the vulnerability class (input validation), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Cisco	Cisco RoomOS Software	version RoomOS 11.24.1.5version RoomOS 11.27.4.0version RoomOS 11.31.1.5version RoomOS 11.27.3.0version RoomOS 11.28.1.3version RoomOS 11.27.2.0version RoomOS 11.24.4.1version RoomOS 11.24.3.0 and 60 more version RoomOS 11.24.2.4version RoomOS 11.32.2.1version RoomOS 11.23.1.8version RoomOS 11.23.1.6version RoomOS 11.20.3.0version RoomOS 11.17.4.0version RoomOS 11.14.5.0version RoomOS 11.20.2.3version RoomOS 11.17.3.0version RoomOS 10.19 StepUpgversion RoomOS 11.35.1.2version RoomOS 26.5.2.0version RoomOS 11.37.1.0version RoomOS 11.36.1.1version RoomOS 26.3.1.3version RoomOS 26.4.1.4version RoomOS 26.4.1.6version RoomOS 11.32.5.1version RoomOS 26.2.2.2version RoomOS 11.14.4.0version RoomOS 26.1.1.5version RoomOS 11.32.4.0version RoomOS 11.27.5.0version RoomOS 11.32.3.0version RoomOS 11.34.1.2version RoomOS 26.0.1.2version RoomOS 11.33.1.7version RoomOS 10.11.3.0version RoomOS 10.3.4.0version RoomOS 10.3.2.4version RoomOS 10.19.4.2version RoomOS 10.19.3.0version RoomOS 10.11.6.0version RoomOS 11.1.3.1version RoomOS 10.19.2.2version RoomOS 10.15.5.3version RoomOS 10.15.3.0version RoomOS 10.11.5.2version RoomOS 10.8.2.5version RoomOS 11.5.2.4version RoomOS 11.5.4.6version RoomOS 10.15.2.2version RoomOS 10.11.2.2version RoomOS 11.38.1.1version RoomOS 10.15.4.1version RoomOS 11.17.2.2version RoomOS 11.14.3.0version RoomOS 11.9.2.4version RoomOS 10.3.2.0version RoomOS 11.5.3.3version RoomOS 11.9.3.1version RoomOS 10.11.4.1version RoomOS 10.19.5.6version RoomOS 10.8.4.0version RoomOS 10.3.3.0version RoomOS 11.14.2.1version RoomOS 10.8.3.1version RoomOS 11.1.2.4version RoomOS 11.14.2.3version RoomOS 11.1.4.1	Vulnerable	CVE Program (cve.org) e CISA ADP
Cisco	Roomos	≥ 26.0.1.2 and < 26.5.2.2< 11.32.6.0	Vulnerable	NIST National Vulnerability Database
Cisco	Roomos Cloud	< 11.39.1.1≥ 26.0.1.2 and < 26.7.1.7	Vulnerable	NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

Low

Privileges required

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
7.5	CVSS 3.1	High	3.9	3.6	psirt@cisco.com via NIST National Vulnerability Database
7.5	CVSS 3.1	High	—	—	cisco via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (score shown at the top: psirt@cisco.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-20 · Improper Input Validation

Other CVEs with this weakness →

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).

web/proxy/WAF logsnetwork IDS/IPS

Timeline

What happened to this CVE, newest first.

2026
Affected products added · cisco/cisco roomos software
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 15, 2026
CVSS changed · 7.5
Oct 15, 2026 · NIST National Vulnerability Database
Source status changed · → Undergoing Analysis
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Jul 15, 2026 · cisco

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

2 on the record

sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-room
Vendor Advisory, NIST National Vulnerability Database
www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identi
NIST National Vulnerability Database

Elsewhere on this site

Cisco
every CVE for this vendor

Input validation
same class

CWE-20
other pages naming this weakness

Related CVEs (same products)

Medium CVE-2026-20289 Insertion of Sensitive Information into Log File in Cisco Roomos Aug 5, 2026
High CVE-2026-20150 Cisco RoomOS Security Hardening Release - Access Control Vulnerabilities Jul 15, 2026
Critical CVE-2026-20156 Cisco RoomOS Security Hardening Release - Buffer Management Vulnerabilities Jul 15, 2026
Critical CVE-2026-20157 Cisco RoomOS Security Hardening Release - Missing Encryption Vulnerabilities Jul 15, 2026
High CVE-2026-20158 Cisco RoomOS Security Hardening Release - Resource Lifetime Management Vulnerabilities Jul 15, 2026
High CVE-2026-20187 Cisco RoomOS Security Hardening Release - Exceptional Conditions Handling Vulnerabilities Jul 15, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No FIRST EPSS score.
No fixed version, patch or mitigation documented.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-20153 is "Cisco RoomOS Security Hardening Release - Input Validation Vulnerabilities", rated High. It affects Cisco RoomOS Software (Cisco); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.5 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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