How severe is CVE-2011-4007?

CVE-2011-4007 has a CVSS 2.0 base score of 5.4, rated medium severity.

Is CVE-2011-4007 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-4007?

CVE-2011-4007 primarily affects Cisco Ios. In total, 21 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-4007?

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

When was CVE-2011-4007 published?

CVE-2011-4007 was published on 2012-05-02 and last updated on 2026-06-16.

CVE-2011-4007

CVE-2011-4007 is a medium-severity vulnerability in Cisco Ios with a CVSS 2.0 base score of 5.4. 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-20.

Key facts

Severity: Medium (CVSS 2.0 base score 5.4)
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Cisco Ios
Published: 2012-05-02
Last modified: 2026-06-16

Description

Cisco IOS 15.0 and 15.1 and IOS XE 3.x do not properly handle the "set mpls experimental imposition" command, which allows remote attackers to cause a denial of service (device crash) via network traffic that triggers (1) fragmentation or (2) reassembly, aka Bug ID CSCtr56576.

Frequently asked questions

What is CVE-2011-4007?: Cisco IOS 15.0 and 15.1 and IOS XE 3.x do not properly handle the "set mpls experimental imposition" command, which allows remote attackers to cause a denial of service (device crash) via network traffic that triggers (1) fragmentation or (2) reassembly, aka Bug ID CSCtr56576.
How severe is CVE-2011-4007?: CVE-2011-4007 has a CVSS 2.0 base score of 5.4, rated medium severity.
Is CVE-2011-4007 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-4007?: CVE-2011-4007 primarily affects Cisco Ios. In total, 21 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-4007?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-4007 published?: CVE-2011-4007 was published on 2012-05-02 and last updated on 2026-06-16.

References

Affected products (21)

cpe:2.3:o:cisco:ios:15.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.1.0s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.1.0sg:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.1.1s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.1.1sg:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.1.2s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.1.3s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.1.4s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.2.0s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.2.0sg:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.2.1s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.2.1sg:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.2.2s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.3.0s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.3.1s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.3.2s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.3.3s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.4.0s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.4.1s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.5.0s:*:*:*:*:*:*:*

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