njs through 0.4.3, used in NGINX, has an out-of-bounds read in njs_lvlhsh_level_find in njs_lvlhsh.c.

published 2020-08-13 6y ago modified 2026-06-17 4mo ago also EUVD-2020-17081

cvss: 5.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 36%
public exploits: 0; none known

Patch / fix

distros 1 links 1

nginx Azure Linux 3.0 1.25.4-1

azure linux advisories AZL-35029

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

github.com/nginx/njs/issues/323 advisory

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Exploit prediction

0.42% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

github.com https://github.com/nginx/njs/issues/323 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	2.1	AV:L/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness

CWE-125 Out-of-bounds Read

References

github.com /nginx/njs/issues/323
exploit, issue-tracking, patch, third-party-advisory
security.netapp.com /advisory/ntap-20200918-0001/
third-party-advisory

Sources

CVE List CVE-2020-24347
NVD CVE-2020-24347

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