---
title: "CVE-2022-43552\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2022-43552?format=md
keywords: index, follow
---

# CVE-2022-43552

Publication date 21 December 2022

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**5.9 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2022-43552?format=md#impact-score)

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## 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.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| curl | 23.04 lunar | Fixed 7.87.0-1 |
| 22.10 kinetic | Fixed 7.85.0-1ubuntu0.2 |
| 22.04 LTS jammy | Fixed 7.81.0-1ubuntu1.7 |
| 20.04 LTS focal | Fixed 7.68.0-1ubuntu2.15 |
| 18.04 LTS bionic | Fixed 7.58.0-2ubuntu3.22 |
| 16.04 LTS xenial | Fixed 7.47.0-1ubuntu2.19+esm7  Ubuntu Pro |
| 14.04 LTS trusty | Fixed 7.35.0-1ubuntu2.20+esm14  Ubuntu Pro |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)
* [Patch details](https://ubuntu.com/security/CVE-2022-43552?format=md#patch-details)

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### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| curl | * Upstream:   [4f20188](https://github.com/curl/curl/commit/4f20188ac644afe174be6005ef4f6ffba232b8b2) |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

5.9 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | High |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | None |
  | Integrity impact | None |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 5.9 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-43552)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2022-43552)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2022-43552)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2022-43552)

### Related Ubuntu Security Notices (USN)

+ [USN-5788-1](https://usn.ubuntu.com/USN-5788-1)
+ curl vulnerabilities
+ 5 January 2023

+ [USN-5894-1](https://usn.ubuntu.com/USN-5894-1)
+ curl vulnerabilities
+ 27 February 2023

### Other references

* <https://curl.se/docs/CVE-2022-43552.html>
* <https://www.cve.org/CVERecord?id=CVE-2022-43552>