Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerabilities

Multiple vulnerabilities in the Distance Vector Multicast Routing Protocol (DVMRP) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to either immediately crash the Internet Group Management Protocol (IGMP) process or make it consume available memory and eventually crash. The memory consumption may negatively impact other processes that are running on the device. These vulnerabilities are due to the incorrect handling of IGMP packets. An attacker could exploit these vulnerabilities by sending crafted IGMP traffic to an affected device. A successful exploit could allow the attacker to immediately crash the IGMP process or cause memory exhaustion, resulting in other processes becoming unstable. These processes may include, but are not limited to, interior and exterior routing protocols. Cisco will release software updates that address these vulnerabilities.

Weakness: CWE-400, CWE-770

Patcharo shows this vulnerability for information but does not match versions for this product yet.

• Cisco Cisco IOS XR Software · n/a

• 20200829 Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerabilities(opens in a new tab)
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-3569(opens in a new tab)

Cisco (CVE record)

Cisco (CVE record) · 27 Sept 2026, 23:46 UTC · Parser patcharo-cve5/1.1.0

CISA Known Exploited Vulnerabilities

CISA Known Exploited Vulnerabilities · 27 Sept 2026, 23:42 UTC · Parser patcharo-kev/1.0.0

NVD

NVD · 27 Sept 2026, 23:44 UTC · Parser patcharo-nvd/1.0.0

FIRST EPSS

FIRST EPSS · 27 Sept 2026, 23:46 UTC · Parser patcharo-epss/1.0.0

Last verified: 28 Sept 2026, 02:31 UTC