CVE-2009-2958

CVE-2009-2958 is a medium-severity vulnerability in Thekelleys Dnsmasq with a CVSS 2.0 base score of 4.3. Its EPSS exploit-prediction score of 10% places it in the 95th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-399.

Key facts

• Severity: Medium (CVSS 2.0 base score 4.3)
• EPSS exploit prediction: 10% (95th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-399
• Affected product: Thekelleys Dnsmasq
• Published: 2009-09-02
• Last modified: 2026-06-16

Description

The tftp_request function in tftp.c in dnsmasq before 2.50, when --enable-tftp is used, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a TFTP read (aka RRQ) request with a malformed blksize option.

Frequently asked questions

What is CVE-2009-2958?

The tftp_request function in tftp.c in dnsmasq before 2.50, when --enable-tftp is used, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a TFTP read (aka RRQ) request with a malformed blksize option.

How severe is CVE-2009-2958?

CVE-2009-2958 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2009-2958 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 10% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-2958?

CVE-2009-2958 primarily affects Thekelleys Dnsmasq. In total, 76 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-2958?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2009-2958 published?

CVE-2009-2958 was published on 2009-09-02 and last updated on 2026-06-16.

References

• http://secunia.com/advisories/36563
• 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

Affected products (76)

• cpe:2.3:a:thekelleys:dnsmasq:*:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:0.4:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:0.5:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:0.6:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:0.7:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:0.95:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:0.96:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:0.98:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:0.992:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:0.996:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:1.0:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:1.2:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:1.3:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:1.4:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:1.5:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:1.6:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:1.7:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:1.8:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:1.9:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:1.10:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:1.11:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:1.12:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:1.13:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:1.14:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:1.15:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:1.16:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:1.17:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:1.18:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:2.0:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:2.1:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:2.2:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:2.3:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:2.4:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:2.5:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:2.6:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:2.7:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:2.8:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:2.9:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:2.10:*:*:*:*:*:*:*
• cpe:2.3:a:thekelleys:dnsmasq:2.11:*:*:*:*:*:*:*

More vulnerabilities in Thekelleys Dnsmasq

• CVE-2021-45957 — Critical (CVSS 9.8): Dnsmasq 2.86 has a heap-based buffer overflow in answer_request (called from FuzzAnswerTheRequest and fuzz_rfc1035.c).…
• CVE-2021-45956 — Critical (CVSS 9.8): Dnsmasq 2.86 has a heap-based buffer overflow in print_mac (called from log_packet and dhcp_reply). NOTE: the vendor's…
• CVE-2021-45955 — Critical (CVSS 9.8): Dnsmasq 2.86 has a heap-based buffer overflow in resize_packet (called from FuzzResizePacket and fuzz_rfc1035.c)…
• CVE-2021-45954 — Critical (CVSS 9.8): Dnsmasq 2.86 has a heap-based buffer overflow in extract_name (called from answer_auth and FuzzAuth). NOTE: the…
• CVE-2021-45953 — Critical (CVSS 9.8): Dnsmasq 2.86 has a heap-based buffer overflow in extract_name (called from hash_questions and fuzz_util.c). NOTE: the…
• CVE-2021-45952 — Critical (CVSS 9.8): Dnsmasq 2.86 has a heap-based buffer overflow in dhcp_reply (called from dhcp_packet and FuzzDhcp). NOTE: the vendor's…

All CVEs affecting Thekelleys Dnsmasq →

Other CWE-399 (Resource Management Errors) vulnerabilities

• CVE-2015-8104 — Critical (CVSS 10.0): The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows guest OS users to cause a…
• CVE-2015-0339 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
• CVE-2015-0335 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
• CVE-2015-0333 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
• CVE-2014-4121 — Critical (CVSS 10.0): Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, 4.5, 4.5.1, and 4.5.2 does not properly parse internationalized…
• CVE-2014-0560 — Critical (CVSS 10.0): Use-after-free vulnerability in Adobe Reader and Acrobat 10.x before 10.1.12 and 11.x before 11.0.09 on Windows and OS…

Browse all CWE-399 (Resource Management Errors) vulnerabilities →