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CVE-2025-20165

Cisco BroadWorks SIP Denial of Service Vulnerability

High7.5EPSS 0.85%
Published
Updated
Reserved
Assigned by
cisco

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.

Timeline

  1. ID reserved

    By cisco

  2. · 3 months later

    Published

  3. · 27 days later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2025-20165, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVDNVD · Analyzed3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.85% · top 41% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Weakness

Affected products

  • Cisco · Cisco BroadWorks

    • affected 22.0
    • affected 23.0
    • affected RI.2021.02
    • affected 23.0 ap380391
    • affected 23.0 ap380396
    • affected RI.2021.08
    • affected RI.2021.09
    • affected RI.2021.10
    • affected RI.2021.11
    • affected RI.2021.12
    • affected 23.0 ap382281
    • affected 22.0 ap382358
    • affected 23.0 ap382358
    • affected RI.2022.02
    • affected RI.2022.03
    • affected 23.0 ap373151
    • affected 23.0 ap371527
    • affected 22.0 ap353530
    • affected 22.0 ap348633
    • affected 22.0 ap347741
    • affected 22.0 ap352375
    • affected 22.0 ap353911
    • affected 22.0 ap339206
    • affected 22.0 ap351637
    • affected 22.0 ap351160
    • affected 22.0 ap339395
    • affected 23.0 ap372548
    • affected 23.0 ap373098
    • affected 22.0 ap358889
    • affected 22.0 ap359119
    • affected 22.0 ap357087
    • affected 22.0 ap357506
    • affected 22.0 ap361590
    • affected 22.0 ap356317
    • affected 22.0 ap358076
    • affected 22.0 ap355095
    • affected 22.0 ap352969
    • affected 22.0 ap356705
    • affected 23.0 ap375383
    • affected 23.0 ap375465
    • and 2659 more

What to do

Exploitation: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

References (3)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

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Record last updated .