Is CVE-2023-0836 in the CISA KEV catalog?

No. CVE-2023-0836 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-0836?

CVE-2023-0836 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2023-0836?

CVE-2023-0836 has an EPSS score of 1.20% (65th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-0836?

Upgrade haproxy on debian 11 to 2.2.9-2+deb11u5 or later. Fixes are available for 8 affected products.

CVE & CISA-KEV Catalog

CVE-2023-0836

HIGH

7.5

CVSS v3

NVD

Description

An information leak vulnerability was discovered in HAProxy 2.1, 2.2 before 2.2.27, 2.3, 2.4 before 2.4.21, 2.5 before 2.5.11, 2.6 before 2.6.8, 2.7 before 2.7.1. There are 5 bytes left uninitialized in the connection buffer when encoding the FCGI_BEGIN_REQUEST record. Sensitive data may be disclosed to configured FastCGI backends in an unexpected way.

CWE-200Information Exposure CWE-459

How to fix

Remediation Available

haproxyDebian

Fixed in:2.2.9-2+deb11u5CVE-2023-0836

Fixed in:2.6.8-1CVE-2023-0836

haproxyRed Hat / RHEL

Fixed in:0:2.4.22-1.el9RHSA-2023:6496

haproxyRocky

Fixed in:0:2.4.22-1.el9RHSA-2023:6496

haproxy-debuginfoRed Hat / RHEL

Fixed in:0:2.4.22-1.el9RHSA-2023:6496

haproxy-debuginfoRocky

Fixed in:0:2.4.22-1.el9RHSA-2023:6496

haproxy-debugsourceRed Hat / RHEL

Fixed in:0:2.4.22-1.el9RHSA-2023:6496

haproxy-debugsourceRocky

Fixed in:0:2.4.22-1.el9RHSA-2023:6496

haproxyUbuntu

Fixed in:2.4.18-0ubuntu1.3USN-5994-1

Fixed in:2.4.18-1ubuntu1.3USN-5994-1

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

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

1.20%probability of exploitation in 30 days

65thpercentile

Moderate risk: more likely to be exploited than 65% of all known CVEs.

References

Other references2

Related Vulnerabilities

Other CWE-200 (Information Exposure) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-24919	High	8.6	100%	KEV + Ransom	-
CVE-2020-14181	Medium	5.3	100%	-	Fix
CVE-2021-34429	Medium	5.3	99%	-	Fix
CVE-2018-11409	Medium	5.3	98%	-	-
CVE-2021-41277	Critical	10.0	97%	KEV	-
CVE-2016-2183	High	7.5	96%	-	Fix

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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 2025-02-18.