Is CVE-2021-40346 in the CISA KEV catalog?

No. CVE-2021-40346 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-40346?

CVE-2021-40346 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-40346?

CVE-2021-40346 has an EPSS score of 57.93% (99th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-40346?

Upgrade haproxy on debian 11 to 2.2.9-2+deb11u2 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-40346

HIGHEPSS 99th pctl

7.5

CVSS v3

NVD

Description

An integer overflow exists in HAProxy 2.0 through 2.5 in htx_add_header that can be exploited to perform an HTTP request smuggling attack, allowing an attacker to bypass all configured http-request HAProxy ACLs and possibly other ACLs.

CWE-190Integer Overflow

How to fix

Remediation Available

haproxyDebian

Fixed in:2.2.9-2+deb11u2CVE-2021-40346

Fixed in:2.2.16-3CVE-2021-40346

haproxyUbuntu

Fixed in:2.0.13-2ubuntu0.3USN-5063-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploit Intelligence

57.93%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

References

Patch2

Exploit1

jfrog.com

Third-Party Advisory1

debian.org

Other references6

Related Vulnerabilities

Other CWE-190 (Integer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix
CVE-2019-11477	High	7.5	99%	-	Fix
CVE-2023-44443	High	7.8	94%	-	Fix
CVE-2014-0569	High	9.3	90%	-	-
CVE-2017-3599	High	7.5	90%	-	Fix
CVE-2023-21716	Critical	9.8	82%	-	Fix

Embed a live status badge for CVE-2021-40346

Markdown

[![CVE-2021-40346](https://tridentstack.com/cve/badge/CVE-2021-40346.svg)](https://tridentstack.com/cve/CVE-2021-40346)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-40346"><img src="https://tridentstack.com/cve/badge/CVE-2021-40346.svg" alt="CVE-2021-40346"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

See how it works Start freeThis CVE lookup is free and always will be.

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.