CVE-2025-24369 LOW

CVE-2025-24369: Anubis has a bot protection bypass when a sophisticated attacker asks to pass a challenge of difficulty 0

Vendor Xe
Product x
Weakness CWE-807
Published January 27, 2025
Last update January 28, 2025
View on NVD All CVEs

CVSS base score

2.3/10
Attack vector Network
Attack complexity High
Privileges required Low
User interaction None
Confidentiality —
Integrity —

CVSS 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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

January 27, 2025 CVE published
January 28, 2025 Record updated