How severe is CVE-2011-2395?

CVE-2011-2395 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2011-2395 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-2395?

CVE-2011-2395 primarily affects Cisco Ios. In total, 1409 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-2395?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2011-2395 published?

CVE-2011-2395 was published on 2011-06-09 and last updated on 2026-06-16.

CVE-2011-2395

CVE-2011-2395 is a medium-severity vulnerability in Cisco Ios with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-16.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-16
Affected product: Cisco Ios
Published: 2011-06-09
Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2011-2395?: 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.
How severe is CVE-2011-2395?: CVE-2011-2395 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2011-2395 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-2395?: CVE-2011-2395 primarily affects Cisco Ios. In total, 1409 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-2395?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-2395 published?: CVE-2011-2395 was published on 2011-06-09 and last updated on 2026-06-16.

References

Affected products (1409)

cpe:2.3:o:cisco:ios:4.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:4.1.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:4.1.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:8.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:8.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:9.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:9.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:9.14:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:10.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:10.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:10.3\(3.3\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:10.3\(3.4\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:10.3\(4.2\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:10.3\(4.3\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:10.3\(16\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:10.3\(19a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.0\(12\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.0\(17\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.0\(17\)bt:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.0\(18\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.0\(20.3\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.0\(22a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.0\(22b\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.0\(x\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.0.12\(a\)bt:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.1\(5\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.1\(7\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.1\(7\)aa:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.1\(7\)ca:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.1\(9\)ia:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.1\(11\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.1\(12\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.1\(13\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.1\(13\)aa:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.1\(13\)ca:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.1\(13\)ia:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.1\(14\):*:*:*:*:*:*:*

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