CVE-2025-24369CWE-807

Anubis has a bot protection bypass when a sophisticated attacker asks to pass a challenge of difficulty 0

Low · published January 27, 2025

CVSS v4.0
2.3
EPSS
0%
Percentile
34.8
In the wild
Unconfirmed
What it is

Anubis is a tool that allows administrators to protect bots against AI scrapers through bot-checking heuristics and a proof-of-work challenge to discourage scraping from multiple IP addresses. Anubis allows attackers to bypass the bot protection by requesting a challenge, formulates any nonce (such as 42069), and then passes the challenge with difficulty zero. Commit e09d0226a628f04b1d80fd83bee777894a45cd02 fixes this behavior by not using a client-specified difficulty value.

The record
Technical detail
CVSS v4.0
2.3 · LOW
Vector
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
EPSS
0.00415 · 34.8th percentile
Weakness
CWE-807 · Reliance on Untrusted Inputs in a Security Decision
Published
2025-01-27T22:57Z
EPSS history
Timeline
  • 27 JAN 22:57Z
    Anubis has a bot protection bypass when a sophisticated attacker asks to pass a challenge of difficulty 0
    cvelistv5