CVE-2023-20190A vulnerability in the classic access control list (ACL) compression feature of Cisco IOS XR Software could allow an unauthenticated,…
- 5.8MediumCVSS base score
- 0.71%Exploitation in 30 daysEPSS · top 46% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
A vulnerability in the classic access control list (ACL) compression feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass the protection that is offered by a configured ACL on an affected device. This vulnerability is due to incorrect destination address range encoding in the compression module of an ACL that is applied to an interface of an affected device. An attacker could exploit this vulnerability by sending traffic through the affected device that should be denied by the configured ACL. A successful exploit could allow the attacker to bypass configured ACL protections on the affected device, allowing the attacker to access trusted networks that the device might be protecting. There are workarounds that address this vulnerability. This advisory is part of the September 2023 release of the Cisco IOS XR Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: September 2023 Semiannual Cisco IOS XR Software Security Advisory Bundled Publication .
Timeline
ID reserved
By cisco
- 11 months later
· 11 months later
Published
- 11 months later
· 11 months 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
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ciscoCNA (assigner) | 3.1 | Medium5.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N |
| NVDNVD · Modified | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.71% · top 46% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.8.
Affected products
- affected 5.2.0
- affected 5.2.1
- affected 5.2.2
- affected 5.2.4
- affected 5.2.3
- affected 5.2.5
- affected 5.2.47
- affected 5.3.0
- affected 5.3.1
- affected 5.3.2
- affected 5.3.3
- affected 5.3.4
- affected 6.0.0
- affected 6.0.1
- affected 6.0.2
- affected 6.1.1
- affected 6.1.2
- affected 6.1.3
- affected 6.1.4
- affected 6.1.12
- affected 6.1.22
- affected 6.1.32
- affected 6.1.36
- affected 6.1.42
- affected 6.2.1
- affected 6.2.2
- affected 6.2.3
- affected 6.2.25
- affected 6.2.11
- affected 6.3.2
- affected 6.3.3
- affected 6.3.15
- affected 6.4.1
- affected 6.4.2
- affected 6.4.3
- affected 6.5.1
- affected 6.5.2
- affected 6.5.3
- affected 6.5.25
- affected 6.5.26
- and 41 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
- cisco-sa-comp3acl-vGmp6BQ3 (opens in a new tab)x_transferred
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-2023-24369 (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-2023-20190)Record last updated .