CVE-2021-1136 Security feature bypass in Cisco IOS XR Software
An authenticated local attacker can bypass image verification to execute unsigned code during the boot process on affected Cisco routers.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-1136?
CVE-2021-1136 is a medium-severity vulnerability in Cisco Ios Xr, published on 4 Feb 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Multiple vulnerabilities in Cisco Network Convergence System (NCS) 540 Series Routers, only when running Cisco IOS XR NCS540L software images, and Cisco IOS XR Software for the Cisco 8000 Series Routers could allow an authenticated, local attacker to execute unsigned code during the boot process on an affected device. For more information about these vulnerabilities, see the Details section of this advisory.
Weakness: CWE-347
Which versions are affected by CVE-2021-1136?
It affects 1 product.
Products include Cisco Ios Xr.
How do I fix CVE-2021-1136?
No fix has been published for CVE-2021-1136 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-1136 being exploited?
There is no known exploitation of CVE-2021-1136 in the wild and no public exploit code.
Other vulnerabilities in Cisco Ios Xr
- CVE-2020-3118 Cisco IOS XR Software Discovery Protocol Format String
- CVE-2020-3569 Cisco IOS XR Software DVMRP Memory Exhaustion
- CVE-2020-3566 Cisco IOS XR Software DVMRP Memory Exhaustion
- CVE-2010-3035 Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service
- CVE-2022-20821 Cisco IOS XR Open Port
Sources
Also known as GHSA-hrm7-r95m-mcv4.