How severe is CVE-2025-20165?

CVE-2025-20165 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-2025-20165 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-20165?

CVE-2025-20165 affects Cisco Broadworks Network Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-20165?

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-2025-20165 have an EU (EUVD) identifier?

Yes. CVE-2025-20165 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-2157.

When was CVE-2025-20165 published?

CVE-2025-20165 was published on 2025-01-22 and last updated on 2026-06-17.

CVE-2025-20165

CVE-2025-20165 is a high-severity vulnerability in Cisco Broadworks Network Server 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-789.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-2157
Weakness: CWE-789
Affected product: Cisco Broadworks Network Server
Published: 2025-01-22
Last modified: 2026-06-17

Description

A vulnerability in the SIP processing subsystem of Cisco BroadWorks could allow an unauthenticated, remote attacker to halt the processing of incoming SIP requests, resulting in a denial of service (DoS) condition. This vulnerability is due to improper memory handling for certain SIP requests. An attacker could exploit this vulnerability by sending a high number of SIP requests to an affected system. A successful exploit could allow the attacker to exhaust the memory that was allocated to the Cisco BroadWorks Network Servers that handle SIP traffic. If no memory is available, the Network Servers can no longer process incoming requests, resulting in a DoS condition that requires manual intervention to recover.

Frequently asked questions

What is CVE-2025-20165?: A vulnerability in the SIP processing subsystem of Cisco BroadWorks could allow an unauthenticated, remote attacker to halt the processing of incoming SIP requests, resulting in a denial of service (DoS) condition. This vulnerability is due to improper memory handling for certain SIP requests. An attacker could exploit this vulnerability by sending a high number of SIP requests to an affected system. A successful exploit could allow the attacker to exhaust the memory that was allocated to the Cisco BroadWorks Network Servers that handle SIP traffic. If no memory is available, the Network Servers can no longer process incoming requests, resulting in a DoS condition that requires manual intervention to recover.
How severe is CVE-2025-20165?: CVE-2025-20165 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-2025-20165 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-20165?: CVE-2025-20165 affects Cisco Broadworks Network Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-20165?: 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-2025-20165 have an EU (EUVD) identifier?: Yes. CVE-2025-20165 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-2157.
When was CVE-2025-20165 published?: CVE-2025-20165 was published on 2025-01-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:cisco:broadworks_network_server:*:*:*:*:release_independent:*:*:*

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