---
title: CVE-2022-24884
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-2022-24884
---

# CVE-2022-24884

Publication date 6 May 2022

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**7.5 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2022-24884#impact-score)

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## Description

ecdsautils is a tiny collection of programs used for ECDSA (keygen, sign,
verify). `ecdsa\_verify\_[prepare\_]legacy()` does not check whether the
signature values `r` and `s` are non-zero. A signature consisting only of
zeroes is always considered valid, making it trivial to forge signatures.
Requiring multiple signatures from different public keys does not mitigate
the issue: `ecdsa\_verify\_list\_legacy()` will accept an arbitrary number of
such forged signatures. Both the `ecdsautil verify` CLI command and the
libecdsautil library are affected. The issue has been fixed in ecdsautils
0.4.1. All older versions of ecdsautils (including versions before the
split into a library and a CLI utility) are vulnerable.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| ecdsautils | 23.04 lunar | Not affected |
| 22.10 kinetic | Ignored end of life, was needs-triage |
| 22.04 LTS jammy | Fixed 0.3.2+git20151018-2+deb10u1build0.22.04.1 |
| 21.10 impish | Ignored end of life |
| 20.04 LTS focal | Fixed 0.3.2+git20151018-2+deb10u1build0.20.04.1 |
| 18.04 LTS bionic | Fixed 0.3.2+git20151018-2ubuntu0.18.04.1~esm1  Ubuntu Pro |
| 16.04 LTS xenial | Fixed 0.3.2+git20151018-2ubuntu0.16.04.1~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)

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## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

7.5 · High

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.5 · High |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-24884)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2022-24884)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2022-24884)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2022-24884)

### Related Ubuntu Security Notices (USN)

+ [USN-6239-1](https://usn.ubuntu.com/USN-6239-1)
+ ECDSA Util vulnerability
+ 20 July 2023

### Other references

* <https://github.com/freifunk-gluon/ecdsautils/security/advisories/GHSA-qhcg-9ffp-78pw>
* <https://github.com/freifunk-gluon/ecdsautils/commit/1d4b091abdf15ad7b2312535b5b95ad70f6dbd08 (v0.4.1)>
* <https://github.com/freifunk-gluon/ecdsautils/commit/1d4b091abdf15ad7b2312535b5b95ad70f6dbd08>
* <https://github.com/freifunk-gluon/ecdsautils/commit/39b6d0a77414fd41614953a0e185c4eefa2f88ad>
* <https://www.cve.org/CVERecord?id=CVE-2022-24884>