---
title: "CVE-2018-20457\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-2018-20457?format=md
keywords: index, follow
---

# CVE-2018-20457

Publication date 25 December 2018

Last updated 11 July 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-2018-20457?format=md#impact-score)

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## Description

In radare2 through 3.1.3, the assemble function inside
libr/asm/p/asm\_arm\_cs.c allows attackers to cause a denial-of-service
(application crash via an r\_num\_calc out-of-bounds read) by crafting an arm
assembly input because a loop uses an incorrect index in armass.c and
certain length validation is missing in armass64.c, a related issue to
CVE-2018-20459.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| radare2 | 26.04 LTS resolute | Needs evaluation |
| 25.10 questing | Ignored end of life, was needs-triage |
| 25.04 plucky | Ignored end of life, was needs-triage |
| 24.10 oracular | Ignored end of life, was needs-triage |
| 24.04 LTS noble | Needs evaluation |
| 23.10 mantic | Ignored end of life, was needs-triage |
| 23.04 lunar | Ignored end of life, was needs-triage |
| 22.10 kinetic | Not in release |
| 22.04 LTS jammy | Not in release |
| 21.10 impish | Not in release |
| 21.04 hirsute | Not in release |
| 20.10 groovy | Not affected |
| 20.04 LTS focal | Not affected |
| 19.10 eoan | Not affected |
| 19.04 disco | Not affected |
| 18.10 cosmic | Ignored end of life |
| 18.04 LTS bionic | Needs evaluation |
| 16.04 LTS xenial | Needs evaluation |
| 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)

## 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-2018-20457)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2018-20457)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2018-20457)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2018-20457)

### Other references

* <https://github.com/radare/radare2/commit/e5c14c167b0dcf0a53d76bd50bacbbcc0dfc1ae7>
* <https://github.com/radare/radare2/issues/12417>
* <https://github.com/devnexen/radare2/commit/88a8adf080a9f8ed5a4250a2507752e133ba54dd>
* <https://www.cve.org/CVERecord?id=CVE-2018-20457>