CVE-2025-20376VulnerabilityPublished 5 Nov 2025Updated 26 Feb 2026

CVE-2025-20376: Cisco Unified Contact Center Express · Unrestricted File Upload

Affects Cisco Unified Contact Center ExpressSource CVE Database V5

Not known to be exploited · CVSS 6.5 Medium.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.1 base score

6.5Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.4% chance of exploitation in 30 days – higher than 40% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: High
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: High: The attacker is authorized with (i.e., requires) privileges that provide significant (e.g., administrative) control over the vulnerable component that could affect component-wide settings and files.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 5 Nov 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Cisco Cisco Unified Contact Center Express	Affected =10.6 =11.6 =12.0 =10.5 =12.5	Fixed in–

AI-suggested

To mitigate the risk posed by CVE-2025-20376, organizations should immediately verify their Cisco UCCX versions against the affected list and apply any available patches or updates from Cisco as soon as they are released. In the absence of patches, administrators should restrict access to the UCCX web UI to trusted networks and enforce strong authentication mechanisms, including multi-factor authentication for administrative accounts. Regularly audit and monitor administrative access logs for unusual activity to detect potential exploitation attempts. Implement strict file upload policies and consider disabling file uploads where not necessary. Network segmentation should be employed to isolate the UCCX system from broader enterprise networks, limiting the impact of a compromise. Additionally, conduct regular security assessments and penetration testing focused on the contact center infrastructure to identify and remediate similar vulnerabilities. Educate administrators on secure credential management and the risks of privilege escalation attacks. Finally, maintain an incident response plan tailored to contact center environments to quickly respond to any detected compromise.

Description

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.

Impact

The exploitation of CVE-2025-20376 can have severe consequences for organizations using Cisco UCCX. Successful attacks allow adversaries to execute arbitrary commands and escalate privileges to root, effectively gaining full control over the affected system. This can lead to unauthorized access to sensitive customer data, disruption of contact center operations, and potential lateral movement within the corporate network. The confidentiality and integrity of data processed by the contact center could be compromised, resulting in data breaches, regulatory non-compliance, and reputational damage. Although availability is not directly impacted, the attacker’s control over the system could be leveraged to disrupt services indirectly. The requirement for administrative credentials reduces the likelihood of exploitation by external attackers but does not eliminate insider threats or risks from credential theft. Organizations with large-scale deployments of Cisco UCCX, especially those handling sensitive customer interactions or operating in regulated industries, face heightened risks. The broad range of affected versions means many organizations may be vulnerable if patches or mitigations are not applied promptly.

References

sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cc-mult-vuln-gK4TFXSn (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 27 Feb 2026, 00:26 UTC

Technical details

References

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