CVE-2025-20326VulnerabilityPublished 3 Sep 2025

CVE-2025-20326: Cisco Unified Communications Manager · Cross-Site Request Forgery (CSRF)

Affects Cisco Unified Communications ManagerSource CVE Database V5

Not known to be exploited · CVSS 4.3 Medium.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 3.1 base score

4.3Medium

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

EPSS: 0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Scope: Unchanged
Confidentiality: None
Integrity: Low
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: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
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: None: There is no loss of confidentiality within the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on 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 3 Sep 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 2026-10-26.

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 Communications Manager	Affected =12.5 =14 =15	Fixed in–

AI-suggested

European organizations should implement the following specific mitigation strategies: 1) Immediately verify the version of Cisco Unified Communications Manager in use and plan for timely patching or upgrading to versions where this vulnerability is addressed once Cisco releases a fix. 2) Until patches are available, restrict access to the Unified CM management interface to trusted administrative networks using network segmentation and firewall rules to minimize exposure to untrusted networks. 3) Implement strict web browser security policies for administrators, including disabling or restricting the ability to click on untrusted links, and educate users about the risks of social engineering and CSRF attacks. 4) Employ multi-factor authentication (MFA) for accessing the management interface to reduce the risk of unauthorized actions even if a CSRF attack is attempted. 5) Monitor Unified CM logs and network traffic for unusual management actions or access patterns that could indicate exploitation attempts. 6) Consider deploying web application firewalls (WAFs) with CSRF protection capabilities in front of the management interface to detect and block malicious requests. 7) Regularly review and minimize the number of users with administrative privileges on the Unified CM system to reduce the potential impact of compromised accounts. These targeted measures go beyond generic advice by focusing on access control, user behavior, and monitoring specific to the affected product and vulnerability.

Description

A vulnerability in the web-based management interface of Cisco Unified Communications Manager (Unified CM) Software and Cisco Unified CM Session Management Edition (SME) Software could allow an unauthenticated, remote attacker to conduct a cross-site request forgery (CSRF) attack on an affected device. This vulnerability is due to insufficient CSRF protections for the web-based management interface on an affected device. An attacker could exploit this vulnerability by persuading a user of the interface to click a malicious link. A successful exploit could allow the attacker to perform arbitrary actions with the privilege level of the affected user.

Impact

For European organizations, the impact of this vulnerability could be significant in environments where Cisco Unified Communications Manager is deployed to manage voice and video communications infrastructure. Successful exploitation could allow attackers to perform unauthorized configuration changes or management actions, potentially disrupting communication services or enabling further attacks such as interception or redirection of calls. While the vulnerability does not directly compromise confidentiality or availability, the integrity impact could lead to misconfigurations that degrade service reliability or security posture. Given the reliance on Unified CM in many large enterprises, government agencies, and critical infrastructure sectors across Europe, exploitation could affect business continuity and trust in communication systems. Additionally, compromised management interfaces could be leveraged as footholds for lateral movement within networks. The requirement for user interaction somewhat limits the attack vector, but social engineering tactics could be effective in targeted attacks. The absence of known exploits in the wild suggests that immediate widespread exploitation is unlikely, but the presence of this vulnerability in numerous supported versions necessitates prompt attention.

References

sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cucm-csrf-w762pRYd (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 3 Sep 2025, 18:03 UTC

Technical details

References

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