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CVE-2023-20190

A vulnerability in the classic access control list (ACL) compression feature of Cisco IOS XR Software could allow an unauthenticated,…

Medium5.8EPSS 0.71%
Published
Updated
Reserved
Assigned by
cisco

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 .

Scores

CVSS scores of CVE-2023-20190, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.1Medium5.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
NVDNVD · Modified3.1Medium5.3CVSS: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 (6 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.8.

Weakness

Affected products

  • Cisco · Cisco IOS XR Software

    • 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 (1)

Sources

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

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Record last updated .