How severe is CVE-2009-4912?

CVE-2009-4912 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-2009-4912 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-4912?

CVE-2009-4912 affects Cisco Asa 5580. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2009-4912?

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-2009-4912 published?

CVE-2009-4912 was published on 2010-06-29 and last updated on 2026-06-16.

CVE-2009-4912

CVE-2009-4912 is a critical-severity vulnerability in Cisco Asa 5580 with a CVSS 2.0 base score of 10.0. 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: Critical (CVSS 2.0 base score 10.0)
EPSS exploit prediction: 3% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Cisco Asa 5580
Published: 2010-06-29
Last modified: 2026-06-16

Description

Cisco Adaptive Security Appliances (ASA) 5580 series devices with software before 8.1(2) complete an SSL handshake with an HTTPS client even if this client is unauthorized, which might allow remote attackers to bypass intended access restrictions via an HTTPS session, aka Bug ID CSCso10876.

Frequently asked questions

What is CVE-2009-4912?: Cisco Adaptive Security Appliances (ASA) 5580 series devices with software before 8.1(2) complete an SSL handshake with an HTTPS client even if this client is unauthorized, which might allow remote attackers to bypass intended access restrictions via an HTTPS session, aka Bug ID CSCso10876.
How severe is CVE-2009-4912?: CVE-2009-4912 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2009-4912 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-4912?: CVE-2009-4912 affects Cisco Asa 5580. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2009-4912?: 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-2009-4912 published?: CVE-2009-4912 was published on 2010-06-29 and last updated on 2026-06-16.

References

http://www.cisco.com/en/US/docs/security/asa/asa81/release/notes/asarn812.html

Affected products (1)

cpe:2.3:h:cisco:asa_5580:*:*:*:*:*:*:*:*

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