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CVE-2009-1959

5.0 · MEDIUM

Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13 allows remote IRC servers to cause a denial of service (crash) via an empty command, which triggers a one…

Published Jun 8, 2009irssiCWE-189EPSS 8.38%

Overview

CVE-2009-1959 is a medium-severity vulnerability affecting irssi irssi. It was published on June 8, 2009 and has a CVSS 2.0 base score of 5.0 (MEDIUM).

This vulnerability has a CVSS 2.0 base score of 5.0, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13 allows remote IRC servers to cause a denial of service (crash) via an empty command, which triggers a one-byte buffer under-read and a one-byte buffer underflow.

Remediation

Check the references section for vendor advisories and patches from irssi. Update irssi to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Refbugs.irssi.org/index.php?do=details&task_id=662Reflists.opensuse.org/opensuse-security-announce/2009-07/msg00002.htmlRefsecunia.com/advisories/35685Refsecunia.com/advisories/35812Refsecunia.com/advisories/36152Refwww.irssi.org/ChangeLogRefwww.mandriva.com/security/advisories?name=MDVSA-2009:133Refwww.openwall.com/lists/oss-security/2009/05/29/3Refwww.securityfocus.com/bid/35399Refwww.securitytracker.com/id?1022410

How CyberStrike helps

Frequently asked questions

What is CVE-2009-1959?

CVE-2009-1959 is a medium-severity vulnerability affecting irssi irssi. It was published on June 8, 2009 and has a CVSS 2.0 base score of 5.0 (MEDIUM).

How severe is CVE-2009-1959?

This vulnerability has a CVSS 2.0 base score of 5.0, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2009-1959?

Check the references section for vendor advisories and patches from irssi. Update irssi to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2009-1959?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2009-1959 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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