CVE-2025-20189
A vulnerability in the Cisco Express Forwarding functionality of Cisco IOS XE Software for Cisco ASR 903 Aggregation Services Routers with…
- 7.4HighCVSS base score
- 0.25%Exploitation in 30 daysEPSS · top 84% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
A vulnerability in the Cisco Express Forwarding functionality of Cisco IOS XE Software for Cisco ASR 903 Aggregation Services Routers with Route Switch Processor 3 (RSP3C) could allow an unauthenticated, adjacent attacker to trigger a denial of service (DoS) condition. This vulnerability is due to improper memory management when Cisco IOS XE Software is processing Address Resolution Protocol (ARP) messages. An attacker could exploit this vulnerability by sending crafted ARP messages at a high rate over a period of time to an affected device. A successful exploit could allow the attacker to exhaust system resources, which eventually triggers a reload of the active route switch processor (RSP). If a redundant RSP is not present, the router reloads.
Timeline
ID reserved
By cisco
- 7 months later
· 7 months later
Published
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
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ciscoCNA (assigner) | 3.1 | High7.4 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
| NVDNVD · Analyzed | 3.1 | High7.4 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.25% · top 84% of all CVEs (11 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.4.
Affected products
- affected 3.16.0S
- affected 3.16.1S
- affected 3.16.1aS
- affected 3.16.2S
- affected 3.16.2aS
- affected 3.16.0cS
- affected 3.16.3S
- affected 3.16.2bS
- affected 3.16.3aS
- affected 3.16.4S
- affected 3.16.4aS
- affected 3.16.4bS
- affected 3.16.5S
- affected 3.16.4dS
- affected 3.16.6S
- affected 3.16.7S
- affected 3.16.6bS
- affected 3.16.7aS
- affected 3.16.7bS
- affected 3.16.8S
- affected 3.16.9S
- affected 3.16.10S
- affected 3.17.0S
- affected 3.17.1S
- affected 3.17.2S
- affected 3.17.1aS
- affected 3.17.3S
- affected 3.17.4S
- affected 16.1.1
- affected 16.1.2
- affected 16.1.3
- affected 16.2.1
- affected 16.2.2
- affected 16.3.1
- affected 16.3.2
- affected 16.3.3
- affected 16.3.1a
- affected 16.3.4
- affected 16.3.5
- affected 16.3.5b
- and 226 more
What to do
Exploitation: The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
References
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-13902 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-20189)Record last updated .