CVE-2023-50868

The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU…

High · published February 14, 2024

Patch now

High probability of exploitation

CVSS calls it high at 7.5. It sits in the 99.5th percentile for exploit probability.

CVSS v3.1
7.5
EPSS
74%
Percentile
99.5
In the wild
Unconfirmed
What it is

The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC responses in a random subdomain attack, aka the "NSEC3" issue. The RFC 5155 specification implies that an algorithm must perform thousands of iterations of a hash function in certain situations.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.74295 · 99.5th percentile
Published
2024-02-14T00:00Z
EPSS history
Timeline
  • 14 FEB 00:00Z
    The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU…
    cvelistv5