How severe is CVE-2010-4671?

CVE-2010-4671 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2010-4671 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2010-4671?

CVE-2010-4671 affects Cisco Ios. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2010-4671?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2010-4671 published?

CVE-2010-4671 was published on 2011-01-07 and last updated on 2026-06-16.

CVE-2010-4671

CVE-2010-4671 is a high-severity vulnerability in Cisco Ios with a CVSS 2.0 base score of 7.8. 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-400.

Key facts

Severity: High (CVSS 2.0 base score 7.8)
EPSS exploit prediction: 4% (88th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Cisco Ios
Published: 2011-01-07
Last modified: 2026-06-16

Description

The Neighbor Discovery (ND) protocol implementation in the IPv6 stack in Cisco IOS before 15.0(1)XA5 allows remote attackers to cause a denial of service (CPU consumption and device hang) by sending many Router Advertisement (RA) messages with different source addresses, as demonstrated by the flood_router6 program in the thc-ipv6 package, aka Bug ID CSCti33534.

Frequently asked questions

What is CVE-2010-4671?: The Neighbor Discovery (ND) protocol implementation in the IPv6 stack in Cisco IOS before 15.0(1)XA5 allows remote attackers to cause a denial of service (CPU consumption and device hang) by sending many Router Advertisement (RA) messages with different source addresses, as demonstrated by the flood_router6 program in the thc-ipv6 package, aka Bug ID CSCti33534.
How severe is CVE-2010-4671?: CVE-2010-4671 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2010-4671 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2010-4671?: CVE-2010-4671 affects Cisco Ios. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2010-4671?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2010-4671 published?: CVE-2010-4671 was published on 2011-01-07 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*

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