What is CVE-2024-30251?

CVE-2024-30251 is a high-severity vulnerability in Aiohttp, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2024-05-02.

How severe is CVE-2024-30251?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2024-30251 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Aiohttp

CVE-2024-30251

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. In affected versions an attacker can send a specially crafted POST (multipart/form-data) request. When the aiohttp server processes it, the server will enter an infinite loop and be unable to process any further requests. An attacker can stop the application from serving requests after sending a single request. This issue has been addressed in version 3.9.4. Users are advised to upgrade. Users unable to upgrade may manually apply a patch to their systems. Please see the linked GHSA for instructions.

Published 2024-05-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.011 (64.1th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Aiohttp
Aio-Libs Aiohttp — versions < 3.9.4

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

Public proof-of-concept exploits

References

github.com/aio-libs/aiohttp/security/advisories/GHSA-5m98-qgg9-wh84 (Patch, Vendor Advisory)
github.com/aio-libs/aiohttp/commit/7eecdff163ccf029fbb1ddc9de4169d4aaeb6597 (Patch)
github.com/aio-libs/aiohttp/commit/cebe526b9c34dc3a3da9140409db63014bc4cf19 (Patch)
github.com/aio-libs/aiohttp/commit/f21c6f2ca512a026ce7f0f6c6311f62d6a638866 (Patch)
www.openwall.com/lists/oss-security/2024/05/02/4 (Mailing List)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2024-30251?: CVE-2024-30251 is a high-severity vulnerability in Aiohttp, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2024-05-02.
How severe is CVE-2024-30251?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2024-30251 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.