CVE-2019-1761: Cisco IOS

Medium severity, CVSS 4.3. EPSS: 0.6% chance of exploitation in the next 30 days.

A vulnerability in the Hot Standby Router Protocol (HSRP) subsystem of Cisco IOS and IOS XE Software could allow an unauthenticated, adjacent attacker to receive potentially sensitive information from an affected device. The vulnerability is due to insufficient memory initialization. An attacker could exploit this vulnerability by receiving HSRPv2 traffic from an adjacent HSRP member. A successful exploit could allow the attacker to receive potentially sensitive information from the adjacent device.

Affected products

• Cisco IOS: version 12.2(6)i1 only; version 12.2(33)cx only; version 12.2(33)cy only; version 12.2(33)cy1 only; version 12.2(33)cy2 only; version 12.2(33)ira only; …
• Cisco IOS XE: version 3.2.0ja only; version 3.2.0se only; version 3.2.0sg only; version 3.2.1se only; version 3.2.1sg only; version 3.2.2se only; …

Published 2019-03-28. Last modified 2026-06-17.