CVE-2011-4577

What it is

OpenSSL before 0.9.8s and 1.x before 1.0.0f, when RFC 3779 support is enabled, allows remote attackers to cause a denial of service (assertion failure) via an X.509 certificate containing certificate-extension data associated with (1) IP address blocks or (2) Autonomous System (AS) identifiers.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

8.2% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2012-01-06 01:55 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 23:35 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 8.2% in the next 30 days (EPSS).
• Severity: 4.3 MEDIUM (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2012-01-06 01:55 UTC

Last modified

2026-06-16 23:35 UTC

Exploit probability

8.2% · EPSS, next 30 days

Weakness

CWE-399

Record status

Modified

Affected

• OpenSSL ≤ 0.9.8r
• OpenSSL 0.9.1c
• OpenSSL 0.9.2b
• OpenSSL 0.9.4
• OpenSSL 0.9.5
• OpenSSL 0.9.5a
• OpenSSL 0.9.6
• OpenSSL 0.9.6a

Attack profile CVSS 2.0 · 4.3

Attack vector

Network

Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

Is it in your code?

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