CVE-2021-3749

Inefficient Regular Expression Complexity in axios/axios

7.5 HighPublic exploitFix available

axios is vulnerable to Inefficient Regular Expression Complexity

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

8.52%Up 7.9 points since Sep 1, 2021

What each source reports

CVE List Score used 7.5

Inefficient Regular Expression Complexity in axios/axios

axios is vulnerable to Inefficient Regular Expression Complexity

Record: CVE-2021-3749
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-1333
Updated: 2026-11-02

EUVDEUVD-2021-2040 7.5

axios is vulnerable to Inefficient Regular Expression Complexity

Record: EUVD-2021-2040
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-03

GitHub AdvisoriesGHSA-cph5-m8f7-6c5x 7.5

axios Inefficient Regular Expression Complexity vulnerability

axios before v0.21.2 is vulnerable to Inefficient Regular Expression Complexity.

Record: GHSA-cph5-m8f7-6c5x
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-400, CWE-1333
Updated: 2026-11-02

NVD 7.5

axios is vulnerable to Inefficient Regular Expression Complexity

Record: CVE-2021-3749
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0: 7.8 HighAV:N/AC:L/Au:N/C:N/I:N/A:C
Weakness: CWE-1333, CWE-400
Updated: 2026-11-02

OSV 7.5

axios is vulnerable to Inefficient Regular Expression Complexity

Record: CVE-2021-3749
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2021-3749 7.5

axios is vulnerable to Inefficient Regular Expression Complexity

Record: DEBIAN-CVE-2021-3749
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Show 8 moreShow less

OSVGHSA-cph5-m8f7-6c5x 7.5

axios Inefficient Regular Expression Complexity vulnerability

axios before v0.21.2 is vulnerable to Inefficient Regular Expression Complexity.

Record: GHSA-cph5-m8f7-6c5x
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-1333, CWE-400
Updated: 2026-11-02

OSVRHSA-2022:1276 9.4

Red Hat Security Advisory: Red Hat OpenShift Service Mesh 2.0.9 security update

Record: RHSA-2022:1276
CVSS 3.1: 9.4 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Updated: 2026-11-02

OSVUBUNTU-CVE-2021-3749 7.5

axios is vulnerable to Inefficient Regular Expression Complexity

Record: UBUNTU-CVE-2021-3749
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVCLSA-2026-1774225186 No score

TuxCare security update for axios (5 CVEs)

TuxCare rebuilt axios to address 5 CVEs. Fixed in 0.18.1-tuxcare.1.

Record: CLSA-2026-1774225186
Updated: 2026-11-02

OSVCLSA-2026-1776991067 No score

TuxCare security update for axios (6 CVEs)

TuxCare rebuilt axios to address 6 CVEs. Fixed in 0.15.3-tuxcare.1.

Record: CLSA-2026-1776991067
Updated: 2026-11-02

OSVCLSA-2026-1782521951 No score

TuxCare security update for axios (17 CVEs)

TuxCare rebuilt axios to address 17 CVEs. Fixed in 0.19.2-tuxcare.1.

Record: CLSA-2026-1782521951
Updated: 2026-11-02

OSVCLSA-2026-1782781178 No score

TuxCare security update for axios (16 CVEs)

TuxCare rebuilt axios to address 16 CVEs. Fixed in 0.21.1-tuxcare.1.

Record: CLSA-2026-1782781178
Updated: 2026-11-02

OSVROOT-APP-NPM-CVE-2021-3749 No score

CVE-2021-3749 in @rootio/axios - Patched by Root

Root has patched CVE-2021-3749 in the @rootio/axios package for Root:npm. Multiple fixed versions available.

Record: ROOT-APP-NPM-CVE-2021-3749
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`axios` npm	before 0.21.2	0.21.2
`axios` TuxCare:npm From an advisory covering 5 CVEs	0.18.1-tuxcare.0 up to 0.18.1-tuxcare.1, plus listed versions 0.18.1	0.18.1-tuxcare.1
`axios` TuxCare:npm From an advisory covering 6 CVEs	0.15.3-tuxcare.0 up to 0.15.3-tuxcare.1, plus listed versions 0.15.3	0.15.3-tuxcare.1
`axios` TuxCare:npm From an advisory covering 17 CVEs	0.19.2-tuxcare.0 up to 0.19.2-tuxcare.1, plus listed versions 0.19.2	0.19.2-tuxcare.1
`axios` TuxCare:npm From an advisory covering 16 CVEs	0.21.1-tuxcare.0 up to 0.21.1-tuxcare.1, plus listed versions 0.21.1	0.21.1-tuxcare.1
`node-axios` Debian:12	before 0.21.3+dfsg-1	0.21.3+dfsg-1
`node-axios` Debian:13	before 0.21.3+dfsg-1	0.21.3+dfsg-1
`node-axios` Debian:14	before 0.21.3+dfsg-1	0.21.3+dfsg-1
`servicemesh` Red Hat:service_mesh:2.0::el8 From an advisory covering 16 CVEs	before 0:2.0.9-3.el8	0:2.0.9-3.el8
`servicemesh-istioctl` Red Hat:service_mesh:2.0::el8 From an advisory covering 16 CVEs	before 0:2.0.9-3.el8	0:2.0.9-3.el8

Show 15 moreShow less

Affected packages
Package	Affected	Fixed
`servicemesh-mixc` Red Hat:service_mesh:2.0::el8 From an advisory covering 16 CVEs	before 0:2.0.9-3.el8	0:2.0.9-3.el8
`servicemesh-mixs` Red Hat:service_mesh:2.0::el8 From an advisory covering 16 CVEs	before 0:2.0.9-3.el8	0:2.0.9-3.el8
`servicemesh-pilot-agent` Red Hat:service_mesh:2.0::el8 From an advisory covering 16 CVEs	before 0:2.0.9-3.el8	0:2.0.9-3.el8
`servicemesh-pilot-discovery` Red Hat:service_mesh:2.0::el8 From an advisory covering 16 CVEs	before 0:2.0.9-3.el8	0:2.0.9-3.el8
`kiali` Red Hat:service_mesh:2.0::el8 From an advisory covering 16 CVEs	before 0:v1.24.7.redhat1-1.el8	0:v1.24.7.redhat1-1.el8
`servicemesh-prometheus` Red Hat:service_mesh:2.0::el8 From an advisory covering 16 CVEs	before 0:2.14.0-16.el8.1	0:2.14.0-16.el8.1
`servicemesh-proxy` Red Hat:service_mesh:2.0::el8 From an advisory covering 16 CVEs	before 0:2.0.9-3.el8	0:2.0.9-3.el8
`@rootio/axios` Root:npm	before 0.21.1-root.io.3	0.21.1-root.io.30.21.1-root.io.40.21.1-root.io.5
`axios` Root:npm	before 0.21.1-aikido.3	0.21.1-aikido.30.21.1-aikido.40.21.1-aikido.5
`node-axios` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 0.19.0+dfsg-20.19.0+dfsg-2ubuntu0.1~esm1	None known
`node-axios` Ubuntu:Pro:22.04:LTS	All versions, plus listed versions 0.21.1+dfsg-10.23.0+dfsg-20.24.0+dfsg-10.25.0+dfsg-20.26.0+dfsg-10.26.0+dfsg-1ubuntu0.1~esm1	None known
`node-axios` Ubuntu:Pro:24.04:LTS	All versions, plus listed versions 1.2.1+dfsg-11.5.1+dfsg-11.6.2+dfsg-11.6.8+dfsg-21.6.8+dfsg-2ubuntu0.1~esm1	None known
`node-axios` Ubuntu:25.10	All versions, plus listed versions 1.7.9+dfsg-11.8.4+dfsg-11.11.0+dfsg-1	None known
`node-axios` Ubuntu:26.10	All versions, plus listed versions 1.13.2+dfsg-1build11.16.0-11.18.0-11.19.0-1	None known
`node-axios` Ubuntu:Pro:26.04:LTS	All versions, plus listed versions 1.11.0+dfsg-11.12.1+dfsg-11.13.2+dfsg-1build11.13.2+dfsg-1ubuntu0.1~esm1	None known

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
PoC in GitHub	T-Guerrero/axios-redos	2022-06-12

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, aliases
Nov 6, 2026	affected, facts
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-3749 is a high vulnerability (CVSS 7.5) in Axios, published August 31, 2021. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 8.52%, the 95th percentile. Fixed in axios 0.21.2.

References

Show 101 moreShow less