← Vulnerability feed

Vulnerability record · CVE-2026-20046 · published 11 March 2026

CVE-2026-20046: Cisco ios xr permissions and access controls vulnerability

Cisco · Ios Xr

A vulnerability in task group assignment for a specific CLI command in Cisco IOS XR Software could allow an authenticated, local attacker to elevate privileges and gain full administrative control of an affected device. This vulnerability is due to incorrect mapping of a command to task groups within the source code. An attacker with a low-privileged account could exploit this vulnerability by using the CLI command to bypass the task group–based checks. A successful exploit could allow the attacker to elevate privileges and perform actions on an affected device without authorization checks.

8.8 CVSS 3.1 High EPSS 0.14% · top 97.6% CWE-264 · Permissions and access controls
8.8CVSS 3.1 base score
0.14%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
1 Jul 2026Last modified by NVD

Description

A vulnerability in task group assignment for a specific CLI command in Cisco IOS XR Software could allow an authenticated, local attacker to elevate privileges and gain full administrative control of an affected device. This vulnerability is due to incorrect mapping of a command to task groups within the source code. An attacker with a low-privileged account could exploit this vulnerability by using the CLI command to bypass the task group–based checks. A successful exploit could allow the attacker to elevate privileges and perform actions on an affected device without authorization checks.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-privesc-bF8D5U4W MitigationVendor Advisory

Track CVE-2026-20046 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.8CVE-2020-3118Cisco IOS XR CDP packet parsing flaw allows adjacent code executionCisco IOS XR's Cisco Discovery Protocol implementation fails to properly validate string input in certain CDP message fields, allowing a stack overfl…KEVEPSS 12%analysed8.8CVE-2018-0167Cisco IOS, IOS XE and IOS XR LLDP buffer overflowMultiple buffer overflow flaws exist in the Link Layer Discovery Protocol (LLDP) subsystem of Cisco IOS, IOS XE and IOS XR Software. An unauthenticat…KEVEPSS 3.4%analysed8.6CVE-2020-3569Cisco IOS XR DVMRP IGMP packet handling memory exhaustionCisco IOS XR Software mishandles IGMP packets in its Distance Vector Multicast Routing Protocol (DVMRP) feature, allowing crafted traffic to crash th…KEVEPSS 3.3%analysed8.6CVE-2020-3566Cisco IOS XR DVMRP IGMP queue flaw causes memory exhaustionCisco IOS XR Software mishandles queue management for IGMP packets in its DVMRP feature, allowing uncontrolled memory consumption. An unauthenticated…KEVEPSS 3.7%analysed8.0CVE-2018-0175Cisco IOS, IOS XE and IOS XR LLDP format string flawA format string vulnerability exists in the Link Layer Discovery Protocol (LLDP) subsystem of Cisco IOS, IOS XE and IOS XR Software. An unauthenticat…KEVEPSS 3.5%analysed7.5CVE-2016-6415Cisco IOS IKEv1 memory disclosure via SA negotiationThe IKEv1 server implementation in Cisco IOS, IOS XE, IOS XR and PIX mishandles Security Association negotiation requests, allowing a remote attacker…KEVEPSS 88%analysed7.5CVE-2010-3035Cisco IOS XR BGP peering reset via unrecognized transitive attributeCisco IOS XR 3.4.0 through 3.9.1 mishandles unrecognized transitive BGP attributes when BGP is enabled, allowing a crafted prefix announcement to res…KEVEPSS 5.7%analysed6.5CVE-2022-20821Cisco IOS XR health check RPM exposes Redis port without authenticationThe health check RPM in Cisco IOS XR Software opens TCP port 6379 by default when activated, exposing the Redis instance inside the NOSi container. A…KEVEPSS 11%analysed

Source: NIST National Vulnerability Database (record CVE-2026-20046), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.