VDB-327707 · CVE-2025-30189 · EUVD-2025-37318

Dovecot 2.4 Authentication Cache access control

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.1	$0-$5k	0.00

Summaryinfo

A vulnerability identified as critical has been detected in Dovecot 2.4. The affected element is an unknown function of the component Authentication Cache. The manipulation leads to access control. This vulnerability is uniquely identified as CVE-2025-30189. The attack is possible to be carried out remotely. No exploit exists. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability was found in Dovecot 2.4. It has been rated as critical. This issue affects some unknown functionality of the component Authentication Cache. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

When cache is enabled, some passdb/userdb drivers incorrectly cache all users with same cache key, causing wrong cached information to be used for these users. After cached login, all subsequent logins are for same user. Install fixed version or disable caching either globally or for the impacted passdb/userdb drivers. No publicly available exploits are known.

It is possible to read the advisory at bugzilla.redhat.com. The identification of this vulnerability is CVE-2025-30189. The exploitation is known to be difficult. The attack may be initiated remotely. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 269908 (Fedora 44 : dovecot (2025-d5eb72768a)), which helps to determine the existence of the flaw in a target environment.

Applying the patch a70ce7d3e2f983979e971414c5892c4e30197231 is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the databases at Tenable (269908), EUVD (EUVD-2025-37318) and CERT Bund (WID-SEC-2025-2439). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

Fedora Linux
SUSE openSUSE
Open Source Dovecot

Productinfo

Type

Mail Server Software

Name

Dovecot

Version

License

open-source

CPE 2.3info

🔒

CPE 2.2info

🔒

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 6.1

VulDB Base Score: 5.0
VulDB Temp Score: 4.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.4
CNA Vector: 🔒

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 269908
Nessus Name: Fedora 44 : dovecot (2025-d5eb72768a)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: a70ce7d3e2f983979e971414c5892c4e30197231

Timelineinfo

10/09/2025 Advisory disclosed
10/09/2025 +0 days VulDB entry created
11/28/2025 +50 days VulDB entry last update

Sourcesinfo

Advisory: bugzilla.redhat.com
Status: Confirmed

CVE: CVE-2025-30189 (🔒)
GCVE (CVE): GCVE-0-2025-30189
GCVE (VulDB): GCVE-100-327707
EUVD: 🔒
CERT Bund: WID-SEC-2025-2439 - Dovecot IMAP Server: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen und Offenlegung von Informationen

Entryinfo

Created: 10/09/2025 12:52
Updated: 11/28/2025 16:26
Changes: 10/09/2025 12:52 (53), 10/10/2025 08:15 (2), 10/29/2025 12:40 (7), 10/31/2025 11:12 (12), 10/31/2025 11:45 (1), 11/28/2025 16:26 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.