Public proof of conceptFix available

CVE-2024-38821

Q: Is CVE-2024-38821 actively exploited?

Active exploitation of CVE-2024-38821 has not been confirmed. Its EPSS score was 1.7% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2024-38821?

CVE-2024-38821 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

A public proof of concept exists; no exploitation attested.

Published2024-10-28
Fixed in6.3.4 · 6.2.7 · 6.1.11 · 6.0.13 · 5.8.15 · 5.7.13
WeaknessCWE-770

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

Spring WebFlux applications that have Spring Security authorization rules on static resources can be bypassed under certain circumstances. For this to impact an application, all of the following must be true: * It must be a WebFlux application * It must be using Spring's static resources support * It must have a non-permitAll authorization rule applied to the static resources support

Timeline

dates in UTC

2024-10-2807:15CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub

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-2024-38821?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2024-38821?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

CISA-ADP

Spring webflux

Branch	Affected	Fixed in	Source
6.3	≥ 6.3x, < 6.3.4	6.3.4	CISA-ADP
6.2	≥ 6.2x, < 6.2.7	6.2.7	CISA-ADP
6.1	≥ 6.1x, < 6.1.11	6.1.11	CISA-ADP
6.0	≥ 6.0x, < 6.0.13	6.0.13	CISA-ADP
5.8	≥ 5.8x, < 5.8.15	5.8.15	CISA-ADP
5.7	≥ 5.7.x, < 5.7.13	5.7.13	CISA-ADP

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

Fix

Update Spring webflux to 6.3.4 · 6.2.7 · 6.1.11 · 6.0.13 · 5.8.15 · 5.7.13

Detection

read 2026-10-23 19:24 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 2 repositories, unverifiedmouadk/cve-2024-38821masa42/CVE-2024-38821-POC

Sources

NVDCVE recordread 2026-10-23
CISA-ADPSSVC decisionnone2024-10-31
OpenCVESSVC decisionnone—
CNACVSS 3.19.1read 2026-10-23
CISA-ADPweakness (CWE)CWE-7702024-10-28
FIRST EPSSEPSS score1.7 %2026-10-22
PoC-in-GitHubproof of concept2read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published: 2024-10-28
Last Modified: 2026-06-17
NVD status: Deferred

Frequently asked questions

What is CVE-2024-38821?

Is CVE-2024-38821 actively exploited?

Active exploitation of CVE-2024-38821 has not been confirmed. Its EPSS score was 1.7% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2024-38821?

CVE-2024-38821 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

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