Vulnerability · Published Jan 27, 2025 · Assigned by GitHub_M

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

Low 2.3

In plain English

A low-severity security flaw in x from Xe. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)2.3Low

Exploit odds (30 days)0.4%top 62.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Alpine:v3.23	anubis	1.15.2-r0	ALPINE-CVE-2025-24369
Alpine:v3.24	anubis	1.15.2-r0	ALPINE-CVE-2025-24369
Go	github.com/Xe/x	no fix listed	GO-2025-3424

Affected products (as reported)

Vendor	Product	Versions
Xe	x	< v1.11.0-37-gd98d70a

Weakness: CWE-807 · 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

References

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