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 ExposureCWE-459

How to fix

Remediation Available
haproxyDebian
Fixed in:2.2.9-2+deb11u5CVE-2023-0836
Fixed in:2.6.8-1CVE-2023-0836
Fixed in:2.6.8-1CVE-2023-0836
Fixed in:2.6.8-1CVE-2023-0836
haproxyRed Hat / RHEL
Fixed in:0:2.4.22-1.el9RHSA-2023:6496
Fixed in:0:2.4.22-1.el9RHSA-2023:6496
Fixed in:0:2.4.22-1.el9RHSA-2023:6496
Fixed in:0:2.4.22-1.el9RHSA-2023:6496
Fixed in:0:2.4.22-1.el9RHSA-2023:6496
haproxyRocky
Fixed in:0:2.4.22-1.el9RHSA-2023:6496
Fixed in:0:2.4.22-1.el9RHSA-2023:6496
Fixed in:0:2.4.22-1.el9RHSA-2023:6496
Fixed in:0:2.4.22-1.el9RHSA-2023:6496
Fixed in:0:2.4.22-1.el9RHSA-2023:6496
haproxy-debuginfoRed Hat / RHEL
Fixed in:0:2.4.22-1.el9RHSA-2023:6496
Fixed in:0:2.4.22-1.el9RHSA-2023:6496
Fixed in:0:2.4.22-1.el9RHSA-2023:6496
Fixed in:0:2.4.22-1.el9RHSA-2023:6496
haproxy-debuginfoRocky
Fixed in:0:2.4.22-1.el9RHSA-2023:6496
Fixed in:0:2.4.22-1.el9RHSA-2023:6496
Fixed in:0:2.4.22-1.el9RHSA-2023:6496
Fixed in:0:2.4.22-1.el9RHSA-2023:6496
haproxy-debugsourceRed Hat / RHEL
Fixed in:0:2.4.22-1.el9RHSA-2023:6496
Fixed in:0:2.4.22-1.el9RHSA-2023:6496
Fixed in:0:2.4.22-1.el9RHSA-2023:6496
Fixed in:0:2.4.22-1.el9RHSA-2023:6496
haproxy-debugsourceRocky
Fixed in:0:2.4.22-1.el9RHSA-2023:6496
Fixed in:0:2.4.22-1.el9RHSA-2023:6496
Fixed in:0:2.4.22-1.el9RHSA-2023:6496
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

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
64thpercentile

Moderate risk: more likely to be exploited than 64% of all known CVEs.

References

Other references2
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Markdown

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HTML

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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.