High File handling

CVE-2025-20376 — Cisco Unified Contact Center Express Remote Code Execution Vulnerability

A vulnerability in the web UI of Cisco Unified CCX could allow an authenticated, remote attacker to upload and execute arbitrary files. This vulnerability is due to an insufficient input validation associated to file upload mechanisms. An attacker could exploit this vulnerability by uploading a malicious file to the web UI and executing it. A successful exploit could allow the attacker to execute arbitrary commands on the underlying system and elevate privileges to root. To exploit this vulnerability, the attacker must have valid administrative credentials.

Published Nov 5, 2025 · Updated Oct 13, 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

EPSS 0.5% (30-day exploitation probability)+6
Technical severity (high)+6

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

0.48%

ahead of 40% of scored CVEs · Oct 14, 2026

Affects

Cisco

Unified Contact Center Express

CVSS base

7.2

High · 3 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

can an attacker script the kill-chain steps

Technical impact

Total

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 Unified Contact Center Express).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes matching the vulnerability class (file handling), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Cisco	Unified Contact Center Express	version 11.5(1)SU1ES03version 11.6(2)ES06version 12.5(1)ES01version 12.0(1)ES03version 12.0(1)ES01version 11.6(2)ES05version 12.0(1)ES02version 11.6(2)ES04 and 49 more version 11.6(2)ES03version 11.6(2)ES02version 11.6(2)ES01version 10.6(1)SU3ES03version 11.0(1)SU1ES03version 10.6(1)SU3ES01version 10.5(1)SU1ES10version 12.5(1)ES03version 11.6(1)ES02version 11.5(1)ES01version 10.6(1)SU2version 10.6(1)SU2ES04version 11.6(1)ES01version 10.6(1)SU3ES02version 11.5(1)SU1ES02version 11.5(1)SU1ES01version 11.0(1)SU1ES02version 12.5(1)_SU03_ES03version 12.5(1)_SU03_ES04version 12.5(1)_SU03_ES05version UCCX 15.0.1version 12.5(1)_SU03_ES06version 12.5(1)SU3version 10.5(1)SU1version 10.6(1)version 11.6(1)version 10.6(1)SU1version 10.6(1)SU3version 11.6(2)version 12.0(1)version 11.0(1)SU1version 11.5(1)SU1version 10.5(1)version 12.5(1)version 12.5(1)SU1version 12.5(1)SU2version 12.5(1)_SU03_ES01version 12.5(1)_SU03_ES02version 12.5(1)_SU02_ES03version 12.5(1)_SU02_ES04version 12.5(1)_SU02_ES02version 12.5(1)_SU01_ES02version 12.5(1)_SU01_ES03version 12.5(1)_SU02_ES01version 11.6(2)ES07version 11.6(2)ES08version 12.5(1)_SU01_ES01version 12.0(1)ES04version 12.5(1)ES02	Vulnerable	CVE Program (cve.org) e CISA ADP
Cisco	Unified Contact Center Express	version 15.0< 12.5\(1\)_su03_es07	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

High

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

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
7.2	CVSS 3.1	High	1.2	5.9	nvd@nist.gov via NIST National Vulnerability Database
6.5	CVSS 3.1	Medium	1.2	5.2	psirt@cisco.com via NIST National Vulnerability Database
6.5	CVSS 3.1	Medium	—	—	cisco via CVE Program (cve.org) e CISA ADP

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

Scoring entities (NIST, CNA, ADP) score independently; each score is shown with its origin. For prioritization we use 7.2 (NVD (NIST)) as a conservative provisional reference — not a definitive official score.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-434 · Unrestricted Upload of File with Dangerous Type

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.48%

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).
Monitor file creation in web directories and paths with traversal sequences (../).

web/proxy/WAF logsnetwork IDS/IPSfile integrity (FIM)endpoint telemetry (EDR)

Timeline

What happened to this CVE, newest first.

2026
Affected products added · cisco/cisco unified contact center express
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 13, 2026
CVSS changed · 7.2
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · → Analyzed
Oct 13, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 13, 2026 · NIST National Vulnerability Database
2025
CVE published
Nov 5, 2025 · cisco

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

1 on the record

sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cc-mult-vuln-g
Vendor Advisory, NIST National Vulnerability Database

Elsewhere on this site

Cisco
every CVE for this vendor

File handling
same class

CWE-434
other pages naming this weakness

Related CVEs (same products)

Medium CVE-2026-20117 Multiple Cisco Contact Center Products Cross-Site Scripting Vulnerabilities Mar 11, 2026
Medium CVE-2026-20116 Multiple Cisco Contact Center Products Cross-Site Scripting Vulnerabilities Mar 11, 2026
Medium CVE-2025-20377 Cisco Unified Intelligence Center API Information Disclosure Vulnerability Nov 5, 2025
Critical CVE-2025-20358 Cisco Unified Contact Center Express Editor Authentication Bypass Vulnerability Nov 5, 2025
Medium CVE-2025-20374 Cisco Unified Contact Center Express Arbitrary File Download Vulnerability Nov 5, 2025
High CVE-2025-20375 Cisco Unified Contact Center Express Arbitrary File Upload Vulnerability Nov 5, 2025

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 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-2025-20376 is "Cisco Unified Contact Center Express Remote Code Execution Vulnerability", rated High. It affects Unified Contact Center Express (Cisco); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.2 describes technical severity. EPSS 0.48% estimates the probability of exploitation in 30 days; neither replaces your asset context. 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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