How severe is CVE-2012-3950?

CVE-2012-3950 has a CVSS 2.0 base score of 7.1, rated high severity.

Is CVE-2012-3950 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2012-3950?

CVE-2012-3950 primarily affects Cisco Ios. In total, 291 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2012-3950?

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-2012-3950 published?

CVE-2012-3950 was published on 2012-09-27 and last updated on 2026-06-16.

CVE-2012-3950

CVE-2012-3950 is a high-severity vulnerability in Cisco Ios with a CVSS 2.0 base score of 7.1. 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-399.

Key facts

Severity: High (CVSS 2.0 base score 7.1)
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Cisco Ios
Published: 2012-09-27
Last modified: 2026-06-16

Description

The Intrusion Prevention System (IPS) feature in Cisco IOS 12.3 through 12.4 and 15.0 through 15.2, in certain configurations of enabled categories and missing signatures, allows remote attackers to cause a denial of service (device reload) via DNS packets, aka Bug ID CSCtw55976.

Frequently asked questions

What is CVE-2012-3950?: The Intrusion Prevention System (IPS) feature in Cisco IOS 12.3 through 12.4 and 15.0 through 15.2, in certain configurations of enabled categories and missing signatures, allows remote attackers to cause a denial of service (device reload) via DNS packets, aka Bug ID CSCtw55976.
How severe is CVE-2012-3950?: CVE-2012-3950 has a CVSS 2.0 base score of 7.1, rated high severity.
Is CVE-2012-3950 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2012-3950?: CVE-2012-3950 primarily affects Cisco Ios. In total, 291 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2012-3950?: 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-2012-3950 published?: CVE-2012-3950 was published on 2012-09-27 and last updated on 2026-06-16.

References

Affected products (291)

cpe:2.3:o:cisco:ios:12.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(1a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(2\)ja:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(2\)ja5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(2\)jk:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(2\)jk1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(2\)t3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(2\)t8:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(2\)xa4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(2\)xa5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(2\)xc1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(2\)xc2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(2\)xc3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(2\)xc4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(2\)xe3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(2\)xe4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(3e\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(3h\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(3i\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(4\)eo1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(4\)ja:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(4\)ja1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(4\)t:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(4\)t1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(4\)t2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(4\)t3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(4\)t4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(4\)t8:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(4\)tpc11a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(4\)xd:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(4\)xd1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(4\)xd2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(4\)xe4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(4\)xg1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(4\)xg2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(4\)xg4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(4\)xg5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(4\)xh:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(4\)xk:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.3\(4\)xk1:*:*:*:*:*:*:*

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