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CVE-2023-20125Cisco BroadWorks Network Server TCP Denial of Service Vulnerability

Description

A vulnerability in the local interface of Cisco BroadWorks Network Server could allow an unauthenticated, remote attacker to exhaust system resources, causing a denial of service (DoS) condition. This vulnerability exists because rate limiting does not occur for certain incoming TCP connections. An attacker could exploit this vulnerability by sending a high rate of TCP connections to the server. A successful exploit could allow the attacker to cause TCP connection resources to grow rapidly until the Cisco BroadWorks Network Server becomes unusable. Note: To recover from this vulnerability, either Cisco BroadWorks Network Server software must be restarted or the Cisco BroadWorks Network Server node must be rebooted. For more information, see the section of this advisory. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

Timeline

  1. ID reserved

    By cisco

  2. · 2 years later

    Published

  3. · 11 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-2023-20125, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.1High8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
NVDNVD · Deferred3.1High8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.95% · top 38% of all CVEs (13 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 8.6.

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 1539 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

References1

Sources

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

Badge for a README or a ticket

CVE-2023-20125 badge
[![CVE-2023-20125](https://cveledger.app/badge/CVE-2023-20125.svg)](https://cveledger.app/cve/CVE-2023-20125)

Record last updated .