---
title: "CVE-2019-20334\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-2019-20334?format=md
keywords: index, follow
---

# CVE-2019-20334

Publication date 4 January 2020

Last updated 19 September 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**5.5 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2019-20334?format=md#impact-score)

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## Description

In Netwide Assembler (NASM) 2.14.02, stack consumption occurs in expr#
functions in asm/eval.c. This potentially affects the relationships among
expr0, expr1, expr2, expr3, expr4, expr5, and expr6 (and stdscan in
asm/stdscan.c). This is similar to CVE-2019-6290 and CVE-2019-6291.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2019-20334?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| nasm | 26.04 LTS resolute | Not affected |
| 25.10 questing | Not affected |
| 25.04 plucky | Not affected |
| 24.10 oracular | Ignored end of life, was needs-triage |
| 24.04 LTS noble | Not affected |
| 23.10 mantic | Ignored end of life, was needs-triage |
| 23.04 lunar | Ignored end of life, was needs-triage |
| 22.10 kinetic | Ignored end of life, was needs-triage |
| 22.04 LTS jammy | Not affected |
| 21.10 impish | Ignored end of life |
| 21.04 hirsute | Ignored end of life |
| 20.10 groovy | Ignored end of life |
| 20.04 LTS focal | Vulnerable |
| 19.10 eoan | Ignored end of life |
| 19.04 disco | Ignored end of life |
| 18.04 LTS bionic | Vulnerable |
| 16.04 LTS xenial | Vulnerable |
| 14.04 LTS trusty | Not in release |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Notes

---

### [fabian](https://launchpad.net/~fabian)

The two referenced issues contain no information whether
the cve has been addressed.
Given there is no activity for this cve, marking the status
based on the reproducibility of the referenced pocs.

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

5.5 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 5.5 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-20334)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2019-20334)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2019-20334)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2019-20334)

### Other references

* <https://bugzilla.nasm.us/show_bug.cgi?id=3392548#c4>
* <https://bugzilla.nasm.us/show_bug.cgi?id=3392638>
* <https://www.cve.org/CVERecord?id=CVE-2019-20334>