CVE-2023-20190

MEDIUM

5.3

CVSS Score

Published: September 13, 2023 at 04:43 PM UTC

Updated: June 17, 2026 at 05:29 AM UTC

1 product affected across 1 vendorIOS Xr

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Severity

MEDIUM5.3

Exploit prediction

EPSS 0.7%

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 .

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

IOS Xr · Cisco

95%

v < 7.3.57.5 ≤ v < 7.5.47.6 ≤ v < 7.8.25.2.0 5.2.1 5.2.2 5.2.3 5.2.4 5.2.47 5.2.5 5.3.0 5.3.1 5.3.2 5.3.3 5.3.4 6.0.0 6.0.1 6.0.2 6.1.1 6.1.12 6.1.2 6.1.22 6.1.3 6.1.32 6.1.36 6.1.4 6.1.42 6.2.1 6.2.11 6.2.2 6.2.25 6.2.3 6.3.15 6.3.2 6.3.3 6.4.1 6.4.2 6.4.3 6.5.1 6.5.2 6.5.25 6.5.26 6.5.28 6.5.29 6.5.3 6.5.32 6.5.33 6.6.2 6.6.25 6.6.3 6.6.4 6.7.1 6.7.2 6.7.3 6.7.4 6.8.1 6.8.2 6.9.1 6.9.2 7.0.1 7.0.12 7.0.14 7.0.2 7.1.1 7.1.15 7.1.2 7.1.3 7.2.0 7.2.1 7.2.2 7.3.1 7.3.15 7.3.2 7.3.3 7.4.1 7.4.2 7.5.1 7.5.2 7.5.3 7.6.1 7.6.2 7.7.1 7.7.2 7.8.1 7.9

Affected range stops below 7.3.5, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.5.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.8.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-comp3acl-vGmp6BQ3

References (1)

ExploitVendor Advisory

Source: [email protected]

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-comp3acl-vGmp6BQ3

CVSS

5.3MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: LOW
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-264CWE-863

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