← Vulnerability feed

Vulnerability record · CVE-2021-4091 · published 18 February 2022

CVE-2021-4091: Port389 389-ds-base double free vulnerability

Port389 · 389 Ds Base

A double-free was found in the way 389-ds-base handles virtual attributes context in persistent searches. An attacker could send a series of search requests, forcing the server to behave unexpectedly, and crash.

7.5 CVSS 3.1 High EPSS 2.0% · top 19.9% CWE-415 · Double free
7.5CVSS 3.1 base score, v2 5.0
2.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
8Affected product versions listed by NVD
5References
17 Jun 2026Last modified by NVD

Description

A double-free was found in the way 389-ds-base handles virtual attributes context in persistent searches. An attacker could send a series of search requests, forcing the server to behave unexpectedly, and crash.

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

Affected products

8 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=2030307 Issue TrackingPatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2023/04/msg00026.html
https://bugzilla.redhat.com/show_bug.cgi?id=2030307 Issue TrackingPatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2023/04/msg00026.html
https://lists.debian.org/debian-lts-announce/2025/01/msg00015.html

Track CVE-2021-4091 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2019-5544OpenSLP heap out-of-bounds write in VMware ESXi and Horizon DaaSOpenSLP as shipped in VMware ESXi and Horizon DaaS contains a heap overwrite (out-of-bounds write) flaw. VMware rates it Critical with a maximum CVSS…KEVEPSS 97%analysed9.8CVE-2019-11043PHP-FPM buffer overflow enables remote code executionPHP-FPM in certain configurations writes past allocated buffers into FCGI protocol data space, an out-of-bounds write (CWE-787, CWE-120). It affects …KEVEPSS 100%analysed9.8CVE-2016-4171Adobe Flash Player unspecified remote code execution flawCVE-2016-4171 is an unspecified vulnerability in Adobe Flash Player 21.0.0.242 and earlier that allows remote attackers to execute arbitrary code thr…KEVEPSS 20%analysed9.8CVE-2016-4117Adobe Flash Player unspecified vectors allow arbitrary code executionAdobe Flash Player 21.0.0.226 and earlier contains a critical flaw that lets remote attackers execute arbitrary code through unspecified vectors. Ado…KEVEPSS 94%analysed9.8CVE-2016-3427Oracle Java SE JMX Improper Access Control VulnerabilityCVE-2016-3427 is an unspecified vulnerability in Oracle Java SE 6u113, 7u99, 8u77, Java SE Embedded 8u77, and JRockit R28.3.9, reached through vector…KEVEPSS 92%analysed9.8CVE-2015-2590Oracle Java SE Libraries flaw allows remote code executionCVE-2015-2590 is an unspecified vulnerability in the Libraries component of Oracle Java SE 6u95, 7u80, 8u45 and Java SE Embedded 7u75, 8u33. The reco…KEVEPSS 25%analysed9.8CVE-2015-5123Adobe Flash Player ActionScript 3 BitmapData use-after-freeAdobe Flash Player contains a use-after-free in the ActionScript 3 BitmapData class, triggered by crafted Flash content that overrides a valueOf func…KEVEPSS 19%analysed9.8CVE-2015-5122Adobe Flash Player ActionScript 3 Use-After-Free in DisplayObjectA use-after-free flaw in the DisplayObject class of Adobe Flash Player's ActionScript 3 implementation is triggered by crafted Flash content that mis…KEVEPSS 94%analysed

Source: NIST National Vulnerability Database (record CVE-2021-4091), CISA KEV, FIRST EPSS (scores of 2026-09-30). This page is refreshed as NVD updates the record.