How severe is CVE-2011-3271?

CVE-2011-3271 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-2011-3271 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-3271?

CVE-2011-3271 primarily affects Cisco Ios. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-3271?

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

When was CVE-2011-3271 published?

CVE-2011-3271 was published on 2011-10-03 and last updated on 2026-06-16.

CVE-2011-3271

CVE-2011-3271 is a critical-severity vulnerability in Cisco Ios with a CVSS 2.0 base score of 10.0. Its EPSS exploit-prediction score of 11% places it in the 95th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: Critical (CVSS 2.0 base score 10.0)
EPSS exploit prediction: 11% (95th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Cisco Ios
Published: 2011-10-03
Last modified: 2026-06-16

Description

Unspecified vulnerability in the Smart Install functionality in Cisco IOS 12.2 and 15.1 allows remote attackers to execute arbitrary code or cause a denial of service (device crash) via crafted TCP packets to port 4786, aka Bug ID CSCto10165.

Frequently asked questions

What is CVE-2011-3271?: Unspecified vulnerability in the Smart Install functionality in Cisco IOS 12.2 and 15.1 allows remote attackers to execute arbitrary code or cause a denial of service (device crash) via crafted TCP packets to port 4786, aka Bug ID CSCto10165.
How severe is CVE-2011-3271?: CVE-2011-3271 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2011-3271 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-3271?: CVE-2011-3271 primarily affects Cisco Ios. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-3271?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2011-3271 published?: CVE-2011-3271 was published on 2011-10-03 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:o:cisco:ios:12.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1:*:*:*:*:*:*:*

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