CVE-2020-25687

2021-01-2016:31:41

CWE-122

redhat

www.cve.org

dnsmasq

buffer overflow

remote attacker

denial of service

AI Score

7.2

Confidence

High

EPSS

0.085

Percentile

94.5%

JSON

A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in dnsmasq when DNSSEC is enabled and before it validates the received DNS entries. This flaw allows a remote attacker, who can create valid DNS replies, to cause an overflow in a heap-allocated memory. This flaw is caused by the lack of length checks in rfc1035.c:extract_name(), which could be abused to make the code execute memcpy() with a negative size in sort_rrset() and cause a crash in dnsmasq, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

CNA Affected

[
  {
    "product": "dnsmasq",
    "vendor": "n/a",
    "versions": [
      {
        "status": "affected",
        "version": "dnsmasq 2.83"
      }
    ]
  }
]