CVE-2011-2395

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2011-06-09 · updated 2026-06-16
Weakness: CWE-16

Description

The Neighbor Discovery (ND) protocol implementation in Cisco IOS on unspecified switches allows remote attackers to bypass the Router Advertisement Guarding functionality via a fragmented IPv6 packet in which the Router Advertisement (RA) message is contained in the second fragment, as demonstrated by (1) a packet in which the first fragment contains a long Destination Options extension header or (2) a packet in which the first fragment contains an ICMPv6 Echo Request message.

Affected products

Cisco IOS: 4.1, 4.1.1, 4.1.2, 8.2, 8.3, 9.0 (+1403)

References

http://seclists.org/fulldisclosure/2011/May/446
http://securityreason.com/securityalert/8271
https://exchange.xforce.ibmcloud.com/vulnerabilities/67940
http://seclists.org/fulldisclosure/2011/May/446
http://securityreason.com/securityalert/8271
https://exchange.xforce.ibmcloud.com/vulnerabilities/67940

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