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CVE-2024-2653

69
FAUCET Score

CVE-2024-2653 is a high-severity denial-of-service vulnerability affecting amphp/http, where an unbounded buffer for CONTINUATION frames can lead to an out-of-memory crash. This vulnerability has a CVSS score of 8.2, indicating a critical impact with high availability loss. While there is no known active exploitation or publicly available exploit code, the vulnerability has garnered significant community attention and media coverage, including reports of a new HTTP/2 DoS attack.

Impacted Technologies

VendorProductVersion(s)CPE
AMPHPAmphp/Http
>= v1.6.0-rc1, <= 1.7.2CNA affected
AMPHPAmphp/Http
>= 2.0.0-beta.1, <= 2.1.0CNA affected
AMPHPAmphp/Http-Client
>= v4.0.0-rc10, <= 4.0.0CNA affected

CVSS Data

CVSS version used by this source: 3.1

8.2HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
4.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
83.24%
Probability of exploitation in next 30 days
EPSS Percentile
99.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.8324 is in the 100th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

composerpatch availablevia ghsa
Product: amphp/httpFixed in: 2.1.1
composerpatch availablevia ghsa
Product: amphp/httpFixed in: 1.7.3

Vendor Advisories (2)

composerGHSA-qjfw-cvjf-f4fmhigh

AMPHP Denial of Service via HTTP/2 CONTINUATION Frames

Apr 3, 2024
redhatCVE-2024-2653Important

amphp: CONTINUATION frames DoS

Apr 3, 2024

References

kb.cert.org / vuls/id/421644
github.com / amphp/http-client/security/advisories/GHSA-w8gf-g2vq-j2f4
github.com / amphp/http/security/advisories/GHSA-qjfw-cvjf-f4fm
openwall.com / lists/oss-security/2024/04/03/16