NULL pointer dereference in Dnsmasq - CVE-2009-2958
Published: June 8, 2025 / Updated: June 13, 2025
Vulnerability identifier: #VU110634
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2009-2958
CWE-ID: CWE-476
Exploitation vector: Adjecent network
Exploit availability:
Public exploit is available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error within the tftp_request() function in tftp.c. A remote attacker can trigger denial of service conditions via a TFTP read (aka RRQ) request with a malformed blksize option.
Affected software
Dnsmasq
Gentoo Linux
net-dns/dnsmasq
Gentoo Linux
net-dns/dnsmasq
How to mitigate CVE-2009-2958
Install update from vendor's website.
Dnsmasq - update to 2.50
net-dns/dnsmasq - update to 2.5.0
net-dns/dnsmasq - update to 2.5.0
Links to Public Exploits and PoC-codes
External References
- http://www.coresecurity.com/content/dnsmasq-vulnerabilities
- http://www.redhat.com/support/errata/RHSA-2009-1238.html
- http://www.securityfocus.com/bid/36120
- http://www.thekelleys.org.uk/dnsmasq/CHANGELOG
- http://www.ubuntu.com/usn/USN-827-1
- https://bugzilla.redhat.com/show_bug.cgi?id=519020
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9816
- https://rhn.redhat.com/errata/RHSA-2010-0095.html