CVE-2020-26070 Denial of service in Cisco IOS XR Software
Remote unauthenticated attackers can cause a denial of service on Cisco ASR 9000 routers by exhausting buffer resources via specific network traffic.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-26070?
CVE-2020-26070 is a high-severity denial of service vulnerability in Cisco Ios Xr, published on 12 Nov 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the ingress packet processing function of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper resource allocation when an affected device processes network traffic in software switching mode (punted). An attacker could exploit this vulnerability by sending specific streams of Layer 2 or Layer 3 protocol data units (PDUs) to an affected device. A successful exploit could cause the affected device to run out of buffer resources, which could make the device unable to process or forward traffic, resulting in a DoS condition. The device would need to be restarted to regain functionality.
Weakness: CWE-404
Which versions are affected by CVE-2020-26070?
It affects 1 product.
Products include Cisco Ios Xr.
How do I fix CVE-2020-26070?
No fix has been published for CVE-2020-26070 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2020-26070 being exploited?
There is no known exploitation of CVE-2020-26070 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-wg72-p7jc-jqrx.