CVE-2021-45955: Buffer Overflow
First published: Fri Dec 31 2021(Updated: )
** DISPUTED ** Dnsmasq 2.86 has a heap-based buffer overflow in resize_packet (called from FuzzResizePacket and fuzz_rfc1035.c) because of the lack of a proper bounds check upon pseudo header re-insertion. NOTE: the vendor's position is that CVE-2021-45951 through CVE-2021-45957 "do not represent real vulnerabilities, to the best of our knowledge." However, a contributor states that a security patch (mentioned in 016162.html) is needed.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Thekelleys Dnsmasq | =2.86 | |
| =2.86 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
Frequently Asked Questions
What is the vulnerability ID of this issue?
The vulnerability ID is CVE-2021-45955.
What is the severity of CVE-2021-45955?
The severity of CVE-2021-45955 is critical with a severity value of 9.8.
What is the affected software of CVE-2021-45955?
The affected software is Dnsmasq version 2.86.
What is the CVE description for CVE-2021-45955?
CVE-2021-45955 is a heap-based buffer overflow vulnerability in Dnsmasq 2.86, which can be exploited due to the lack of a proper bounds check.
Are there any known references for CVE-2021-45955?
Yes, you can find references for CVE-2021-45955 at the following URLs: [reference 1](https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35898), [reference 2](https://github.com/google/oss-fuzz-vulns/blob/main/vulns/dnsmasq/OSV-2021-932.yaml), [reference 3](https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016162.html).
- collector/nvd-index
- agent/references
- agent/type
- agent/first-publish-date
- agent/author
- agent/severity
- agent/weakness
- agent/status
- agent/softwarecombine
- agent/description
- agent/event
- agent/tags
- collector/nvd-api
- source/NVD
- agent/software-canonical-lookup
- agent/last-modified-date
- collector/mitre-cve
- source/MITRE
- status/disputed
- vendor/thekelleys
- canonical/thekelleys dnsmasq
- version/thekelleys dnsmasq/2.86