---
title: "CVE-2019-18928\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-2019-18928?format=md
keywords: index, follow
---

# CVE-2019-18928

Publication date 15 November 2019

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**9.8 · Critical**

[Score breakdown](https://ubuntu.com/security/CVE-2019-18928?format=md#impact-score)

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## Description

Cyrus IMAP 2.5.x before 2.5.14 and 3.x before 3.0.12 allows privilege
escalation because an HTTP request may be interpreted in the authentication
context of an unrelated previous request that arrived over the same
connection.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| cyrus-imapd | 24.10 oracular | Fixed 3.0.12-1 |
| 24.04 LTS noble | Fixed 3.0.12-1 |
| 23.10 mantic | Fixed 3.0.12-1 |
| 23.04 lunar | Fixed 3.0.12-1 |
| 22.10 kinetic | Fixed 3.0.12-1 |
| 22.04 LTS jammy | Fixed 3.0.12-1 |
| 21.10 impish | Fixed 3.0.12-1 |
| 21.04 hirsute | Fixed 3.0.12-1 |
| 20.10 groovy | Fixed 3.0.12-1 |
| 20.04 LTS focal | Fixed 3.0.12-1 |
| 19.10 eoan | Ignored end of life |
| 19.04 disco | Ignored end of life |
| 18.04 LTS bionic | Fixed 2.5.10-3ubuntu1.1+esm1  Ubuntu Pro |
| 16.04 LTS xenial | Not in release |
| 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)
* [Patch details](https://ubuntu.com/security/CVE-2019-18928?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 |
| --- | --- |
| cyrus-imapd | * Upstream:   [e675bf7](https://github.com/cyrusimap/cyrus-imapd/commit/e675bf7b0e9c6e160516d274bffaec6f9dccaef7) |

## 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-2019-18928)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2019-18928)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2019-18928)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2019-18928)

### Related Ubuntu Security Notices (USN)

+ [USN-7224-1](https://usn.ubuntu.com/USN-7224-1)
+ Cyrus IMAP Server vulnerabilities
+ 22 January 2025

### Other references

* <https://www.cyrusimap.org/imap/download/release-notes/2.5/x/2.5.14.html>
* <https://www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.12.html>
* <https://www.cve.org/CVERecord?id=CVE-2019-18928>