CVE-2025-24369: Anubis has a bot protection bypass when a sophisticated attacker asks to pass a challenge of difficulty 0
2.3
CVSS
Description
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.
Classification
CVE ID: CVE-2025-24369
CVSS Base Severity: LOW
CVSS Base Score: 2.3
Affected Products
Vendor: Xe
Product: x
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.05% (probability of being exploited)
EPSS Percentile: 17.96% (scored less or equal to compared to others)
EPSS Date: 2025-02-25 (when was this score calculated)
References
https://github.com/Xe/x/security/advisories/GHSA-56w8-8ppj-2p4fhttps://github.com/Xe/x/commit/7bd7b209f4f1b897de85ec8973458dc8be606a8b
https://github.com/Xe/x/commit/e09d0226a628f04b1d80fd83bee777894a45cd02
https://xeiaso.net/notes/2025/GHSA-56w8-8ppj-2p4f