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MEDIUM

CVE-2022-43552

CVSS v3

5.9

MEDIUM

EPSS Score

2.7 %

exploit probability, as of 2026-10-18

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • libcurlAlmaLinux:9all versions · fixed in 7.76.1-23.el9and 4 other packages
  • libcurlAlmaLinux:8all versions · fixed in 7.61.1-30.el8and 3 other packages

Vendor advisories

  • CVE-2022-43552 Red Hat Product Security224 products fixed · 8 known affected

    curl: Use-after-free triggered by an HTTP proxy deny response

    rh-dotnet31-curl as a component of .NET Core 3.1 on Red Hat Enterprise Linux · rh-dotnet31-curl.src as a component of .NET Core 3.1 on Red Hat Enterprise Linux · rh-dotnet31-libcurl as a component of .NET Core 3.1 on Red Hat Enterprise Linux

  • RHSA-2024:0428 Red Hat Product Security45 products fixed

    Red Hat Security Advisory: curl security and bug fix update

  • RHSA-2023:7743 Red Hat Product Security48 products fixed

    Red Hat Security Advisory: curl security update

  • ICSA-23-348-10 CISA5 known affected

    Siemens SIMATIC S7-1500

    SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)

  • SSA-398330 Siemens ProductCERT5 known affected

    SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5

    SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= V3.1.0 < V3.1.5 · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= V3.1.0 < V3.1.5 · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= V3.1.0 < V3.1.5

  • RHSA-2023:3354 Red Hat Product Security11 products fixed

    Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.51 SP2 security update

5 more advisories

Full record on NVD

Description

A use after free vulnerability exists in curl <7.87.0. Curl can be asked to *tunnel* virtually all protocols it supports through an HTTP proxy. HTTP proxies can (and often do) deny such tunnel operations. When getting denied to tunnel the specific protocols SMB or TELNET, curl would use a heap-allocated struct after it had been freed, in its transfer shutdown code path.

Technical details

Published
2023-02-09

Frequently asked questions

What is CVE-2022-43552?

A use after free vulnerability exists in curl <7.87.0. Curl can be asked to *tunnel* virtually all protocols it supports through an HTTP proxy. HTTP proxies can (and often do) deny such tunnel operations. When getting denied to tunnel the specific protocols SMB or TELNET, curl would use a heap-allocated struct after it had been freed, in its transfer shutdown code path.

Is CVE-2022-43552 actively exploited?

Active exploitation of CVE-2022-43552 has not been confirmed. Its EPSS score was 2.7% on 2026-10-18, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2022-43552?

CVE-2022-43552 has a CVSS v3 base score of 5.9 (MEDIUM severity).

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