Public proof of concept

CVE-2024-27983

A public proof of concept exists; no exploitation attested.

Published2024-04-09
WeaknessCWE-362

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

An attacker can make the Node.js HTTP/2 server completely unavailable by sending a small amount of HTTP/2 frames packets with a few HTTP/2 frames inside. It is possible to leave some data in nghttp2 memory after reset when headers with HTTP/2 CONTINUATION frame are sent to the server and then a TCP connection is abruptly closed by the client triggering the Http2Session destructor while header frames are still being processed (and stored in memory) causing a race condition.

Timeline

dates in UTC

2024-04-0901:15CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2024-27983?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2024-27983?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

CISA-ADP

Nodejs

Branch	Affected	Fixed in	Source
18.20	≤ 18.20.0	no fix published	CISA-ADP
20.12	≤ 20.12.0	no fix published	CISA-ADP
21.7	≤ 21.7.1	no fix published	CISA-ADP

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

No fix published by the sources we read yet. NVD record

Detection

read 2026-10-23 19:24 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 1 repository, unverifiedlirantal/CVE-2024-27983-nodejs-http2

Sources

NVDCVE recordread 2026-10-23
CISA-ADPSSVC decisionnone2024-04-09
OpenCVESSVC decisionnone—
CNACVSS 3.08.2read 2026-10-23
CISA-ADPweakness (CWE)CWE-3622024-08-22
FIRST EPSSEPSS score87.2 %read 2026-10-23
PoC-in-GitHubproof of concept1read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Published: 2024-04-09
Last Modified: 2026-06-17
NVD status: Deferred

Frequently asked questions

What is CVE-2024-27983?

Is CVE-2024-27983 actively exploited?

Active exploitation of CVE-2024-27983 has not been confirmed. Its EPSS score was 87.2% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2024-27983?

CVE-2024-27983 has a CVSS v3 base score of 8.2 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H.

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