HOME VULNERABILITIESCVE-2019-18928

CRITICAL

CVE-2019-18928

NVD-CWE-noinfoPublished: November 15, 2019· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official 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.

Technical Analysis

CVE-2019-18928 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Affected Vendors & Products

cyrus1 product(s)

imap

Debian1 product(s)

debian linux

Fedora1 product(s)

fedora

Source: NVD CPE · 4 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://www.cyrusimap.org/imap/download/release-notes/2.5/x/2.5.14.html

PATCHhttps://www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.12.html

PATCHhttps://www.cyrusimap.org/imap/download/release-notes/2.5/x/2.5.14.html

PATCHhttps://www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.12.html

ADVISORYhttps://lists.debian.org/debian-lts-announce/2022/06/msg00013.html

ADVISORYhttps://lists.debian.org/debian-lts-announce/2022/06/msg00013.html

All References (10)

→

https://lists.debian.org/debian-lts-announce/2022/06/msg00013.htmlMailing List · Third Party Advisory

→

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LAGKPZDXQ6KRUGQVRAO6N4PCINP6KS5F/

→

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PHV3TUU53WCKJ3BBRK2EHAF44MSZEFK6/

→

https://www.cyrusimap.org/imap/download/release-notes/2.5/x/2.5.14.htmlPatch · Release Notes · Third Party Advisory

→

https://www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.12.htmlPatch · Release Notes · Third Party Advisory

→

https://lists.debian.org/debian-lts-announce/2022/06/msg00013.htmlMailing List · Third Party Advisory

→

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LAGKPZDXQ6KRUGQVRAO6N4PCINP6KS5F/

→

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PHV3TUU53WCKJ3BBRK2EHAF44MSZEFK6/

→

https://www.cyrusimap.org/imap/download/release-notes/2.5/x/2.5.14.htmlPatch · Release Notes · Third Party Advisory

→

https://www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.12.htmlPatch · Release Notes · Third Party Advisory

Quick Facts

CVE IDCVE-2019-18928

CVSS Score9.8 / 10

SeverityCRITICAL

WeaknessNVD-CWE-noinfo

CISA KEVNo

Affected3 vendor(s)

PublishedNov 15, 2019

Related CVEs (NVD-CWE-noinfo)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2019-18928 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.

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