What’s Vulnerable › Vulnerabilities

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

• Severity: low (CVSS 2.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-01-27 · updated 2026-06-17
• Weakness: CWE-807

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.

Affected products

• Xe x: before v1.11.0-37-gd98d70a

References

• https://github.com/Xe/x/commit/7bd7b209f4f1b897de85ec8973458dc8be606a8b
• https://github.com/Xe/x/commit/e09d0226a628f04b1d80fd83bee777894a45cd02
• https://github.com/Xe/x/security/advisories/GHSA-56w8-8ppj-2p4f
• https://xeiaso.net/notes/2025/GHSA-56w8-8ppj-2p4f

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