CVE-2025-20139
CVE-2025-20139 is a high-severity vulnerability in Cisco Enterprise Chat And Email with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-185.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- EPSS exploit prediction: 1% (46th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-9561
- Weakness: CWE-185
- Affected product: Cisco Enterprise Chat And Email
- Published:
- Last modified:
Description
A vulnerability in chat messaging features of Cisco Enterprise Chat and Email (ECE) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. This vulnerability is due to improper validation of user-supplied input to chat entry points. An attacker could exploit this vulnerability by sending malicious requests to a messaging chat entry point in the affected application. A successful exploit could allow the attacker to cause the application to stop responding, resulting in a DoS condition. The application may not recover on its own and may need an administrator to manually restart services to recover.
Frequently asked questions
- What is CVE-2025-20139?
- A vulnerability in chat messaging features of Cisco Enterprise Chat and Email (ECE) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. This vulnerability is due to improper validation of user-supplied input to chat entry points. An attacker could exploit this vulnerability by sending malicious requests to a messaging chat entry point in the affected application. A successful exploit could allow the attacker to cause the application to stop responding, resulting in a DoS condition. The application may not recover on its own and may need an administrator to manually restart services to recover.
- How severe is CVE-2025-20139?
- CVE-2025-20139 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2025-20139 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2025-20139?
- CVE-2025-20139 affects Cisco Enterprise Chat And Email. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2025-20139?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2025-20139 have an EU (EUVD) identifier?
- Yes. CVE-2025-20139 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-9561.
- When was CVE-2025-20139 published?
- CVE-2025-20139 was published on 2025-04-02 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:cisco:enterprise_chat_and_email:*:*:*:*:*:*:*:*
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