How severe is CVE-2011-0963?

CVE-2011-0963 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2011-0963 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-0963?

CVE-2011-0963 primarily affects Cisco Nac Guest Server. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-0963?

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

When was CVE-2011-0963 published?

CVE-2011-0963 was published on 2011-03-31 and last updated on 2026-06-16.

CVE-2011-0963

CVE-2011-0963 is a medium-severity vulnerability in Cisco Nac Guest Server 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-264.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Cisco Nac Guest Server
Published: 2011-03-31
Last modified: 2026-06-16

Description

The default configuration of the RADIUS authentication feature on the Cisco Network Admission Control (NAC) Guest Server with software before 2.0.3 allows remote attackers to bypass intended access restrictions and obtain network connectivity via unspecified vectors, aka Bug ID CSCtj66922.

Frequently asked questions

What is CVE-2011-0963?: The default configuration of the RADIUS authentication feature on the Cisco Network Admission Control (NAC) Guest Server with software before 2.0.3 allows remote attackers to bypass intended access restrictions and obtain network connectivity via unspecified vectors, aka Bug ID CSCtj66922.
How severe is CVE-2011-0963?: CVE-2011-0963 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2011-0963 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-0963?: CVE-2011-0963 primarily affects Cisco Nac Guest Server. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-0963?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-0963 published?: CVE-2011-0963 was published on 2011-03-31 and last updated on 2026-06-16.

References

Affected products (9)

cpe:2.3:h:cisco:nac_guest_server:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:nac_guest_server_software:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:nac_guest_server_software:1.0.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:nac_guest_server_software:1.1.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:nac_guest_server_software:1.1.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:nac_guest_server_software:1.1.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:nac_guest_server_software:1.1.3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:nac_guest_server_software:2.0.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:nac_guest_server_software:2.0.1:*:*:*:*:*:*:*

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