---
title: "CVE-2022-3515\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-2022-3515?format=md
keywords: index, follow
---

# CVE-2022-3515

Publication date 17 October 2022

Last updated 25 August 2025

---

Ubuntu priority

**High**

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

## Cvss 3 Severity Score

**9.8 · Critical**

[Score breakdown](https://ubuntu.com/security/CVE-2022-3515?format=md#impact-score)

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## Description

A vulnerability was found in the Libksba library due to an integer overflow
within the CRL parser. The vulnerability can be exploited remotely for code
execution on the target system by passing specially crafted data to the
application, for example, a malicious S/MIME attachment.

### From the Ubuntu Security Team

It was discovered that an integer overflow could be triggered in
Libksba when decoding certain data. An attacker could use this issue
to cause a denial of service (application crash) or possibly execute
arbitrary code.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| libksba | 22.10 kinetic | Fixed 1.6.0-3ubuntu1 |
| 22.04 LTS jammy | Fixed 1.6.0-2ubuntu0.1 |
| 20.04 LTS focal | Fixed 1.3.5-2ubuntu0.20.04.1 |
| 18.04 LTS bionic | Fixed 1.3.5-2ubuntu0.18.04.1 |
| 16.04 LTS xenial | Fixed 1.3.3-1ubuntu0.16.04.1+esm1  Ubuntu Pro |
| 14.04 LTS trusty | Fixed 1.3.0-3ubuntu0.14.04.2+esm1  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-2022-3515?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 |
| --- | --- |
| libksba | * Upstream:   <https://dev.gnupg.org/rK4b7d9cd4a018898d7714ce06f3faf2626c14582b> |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

9.8 · Critical

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 9.8 · Critical |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-3515)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2022-3515)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2022-3515)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2022-3515)

### Related Ubuntu Security Notices (USN)

+ [USN-5688-1](https://usn.ubuntu.com/USN-5688-1)
+ Libksba vulnerability
+ 19 October 2022

+ [USN-5688-2](https://usn.ubuntu.com/USN-5688-2)
+ Libksba vulnerability
+ 26 October 2022

### Other references

* <https://gnupg.org/blog/20221017-pepe-left-the-ksba.html>
* <https://www.cve.org/CVERecord?id=CVE-2022-3515>