Vulnerability Monitor

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CVE-2009-1959

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.

Security Impact Summary

CVE-2009-1959 is a security vulnerability that . Impacting 1 product from irssi organizations running these solutions should prioritize assessment and patching.

Historical Context

Originally identified in 2009, this vulnerability predates many modern security frameworks and practices. The vulnerability landscape of that era was characterized by different threat models and less mature defense mechanisms compared to contemporary standards.

Published

2009-06-08T01:00:00.767

Last Modified

2025-04-09T00:30:58.490

Status

Deferred

Source

[email protected]

Severity

CVSSv2: 5.0 (MEDIUM)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Primary
CWE-189

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	irssi	irssi	0.8.13	Yes

References

http://bugs.irssi.org/index.php?do=details&task_id=662 Exploit, Vendor Advisory ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2009-07/msg00002.html ([email protected])
http://secunia.com/advisories/35685 ([email protected])
http://secunia.com/advisories/35812 ([email protected])
http://secunia.com/advisories/36152 ([email protected])
http://www.irssi.org/ChangeLog Exploit, Vendor Advisory ([email protected])
http://www.mandriva.com/security/advisories?name=MDVSA-2009:133 ([email protected])
http://www.openwall.com/lists/oss-security/2009/05/29/3 ([email protected])
http://www.securityfocus.com/bid/35399 ([email protected])
http://www.securitytracker.com/id?1022410 ([email protected])
http://www.ubuntu.com/usn/usn-800-1 ([email protected])
http://www.vupen.com/english/advisories/2009/1596 ([email protected])
http://xorl.wordpress.com/2009/05/28/irssi-event_wallops-off-by-one-readwrite/ Exploit ([email protected])
https://exchange.xforce.ibmcloud.com/vulnerabilities/51184 ([email protected])
https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00146.html ([email protected])
http://bugs.irssi.org/index.php?do=details&task_id=662 Exploit, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2009-07/msg00002.html (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/35685 (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/35812 (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/36152 (af854a3a-2127-422b-91ae-364da2661108)
http://www.irssi.org/ChangeLog Exploit, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.mandriva.com/security/advisories?name=MDVSA-2009:133 (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2009/05/29/3 (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/35399 (af854a3a-2127-422b-91ae-364da2661108)
http://www.securitytracker.com/id?1022410 (af854a3a-2127-422b-91ae-364da2661108)
http://www.ubuntu.com/usn/usn-800-1 (af854a3a-2127-422b-91ae-364da2661108)
http://www.vupen.com/english/advisories/2009/1596 (af854a3a-2127-422b-91ae-364da2661108)
http://xorl.wordpress.com/2009/05/28/irssi-event_wallops-off-by-one-readwrite/ Exploit (af854a3a-2127-422b-91ae-364da2661108)
https://exchange.xforce.ibmcloud.com/vulnerabilities/51184 (af854a3a-2127-422b-91ae-364da2661108)
https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00146.html (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For irssi's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.