CVE-2023-24807 | Undici vulnerable to Regular Expression Denial of Service in Headers

Undici is an HTTP/1.1 client for Node.js. Prior to version 5.19.1, the `Headers.set()` and `Headers.append()` methods are vulnerable to Regular Expression Denial of Service (ReDoS) attacks when untrusted values are passed into the functions. This is due to the inefficient regular expression used to normalize the values in the `headerValueNormalize()` utility function. This vulnerability was patched in v5.19.1. No known workarounds are available.

Published: 2023-02-16 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-24807 is rated Moderate Risk (46.9/100): CVSS High severity, with low exploitation likelihood (EPSS 0.25%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-24807

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-12-13 0.23% 0.25% +0.02%
2 2025-11-22 0.25% 0.23% -0.02%
3 2025-11-21 — 0.25% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-24807

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2023-24807

GitHub Security Advisory for CVE-2023-24807

GHSA-r6ch-mqf9-qc9w · Severity: high · Ecosystem: npm — Regular Expression Denial of Service in Headers

OS Trackers for CVE-2023-24807

vendor priority summary link
alpine high CVE-2023-24807: 1 source package rows (nodejs); 7 state rows across 7 repos (3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 7, open 0. https://security.alpinelinux.org/vuln/CVE-2023-24807
debian not yet assigned CVE-2023-24807 not yet assigned priority: Debian including 1 source packages (node-undici), 4 status rows across 4 suites (bookworm, forky, sid, trixie): resolved 4. https://security-tracker.debian.org/tracker/CVE-2023-24807
redhat low — https://access.redhat.com/security/cve/CVE-2023-24807
suse high CVE-2023-24807 severity important: SUSE including 71 source package names (16-7.1:nodejs16-16.19.1-150400.3.15.1, 16-7.1:npm16-16.19.1-150400.3.15.1, …), 253 product×package rows across 26 product lines (Container bci/nodejs, SUSE CaaS Platform 4.0, … (26 product lines)): Known Not Affected 132, Fixed 121. https://www.suse.com/security/cve/CVE-2023-24807/
ubuntu medium CVE-2023-24807 medium priority: Ubuntu including 1 source packages (node-undici), 9 status rows across 9 suites (bionic, focal, jammy, kinetic, lunar, mantic, trusty, upstream, xenial): ignored 4, DNE 3, not-affected 1, released 1. https://ubuntu.com/security/CVE-2023-24807

Affected software / configurations for CVE-2023-24807

Vendor Product Version Raw CPE
nodejs undici < 5.19.1 cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*

References for CVE-2023-24807

cvelogic Threat Intelligence