CVE-2021-4091· NVD / CVE Program· CNA redhat

A double-free was found in the way 389-ds-base handles virtual attributes context in persistent searches.

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.

HighCVSS 7.5 · v3.1—No exploit Fix available

Published: Feb 18, 2022
Updated: Jun 17, 2026
EPSS: 2.0% · 80th percentile
CWE: CWE-415

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Action score

Monitor

Low priority for now.

CVSS: 30 / 40 · 7.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 1 / 30 · 2.0%

Noroxi analysis

No Noroxi analysis for this record yet

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Affected systems

Vendor	Product	CPE
port389	389-ds-base	cpe:2.3:a:port389:389-ds-base
redhat	enterprise linux desktop	cpe:2.3:o:redhat:enterprise_linux_desktop
redhat	enterprise linux for ibm z systems	cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems
redhat	enterprise linux for power big endian	cpe:2.3:o:redhat:enterprise_linux_for_power_big_endian
redhat	enterprise linux for power little endian	cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian
redhat	enterprise linux for scientific computing	cpe:2.3:o:redhat:enterprise_linux_for_scientific_computing
redhat	enterprise linux server	cpe:2.3:o:redhat:enterprise_linux_server
redhat	enterprise linux workstation	cpe:2.3:o:redhat:enterprise_linux_workstation

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

port389 389-ds-basebefore 1.3.10.2
redhat enterprise linux desktop7
redhat enterprise linux for ibm z systems7.0
redhat enterprise linux for power big endian7.0
redhat enterprise linux for power little endian7.0
redhat enterprise linux for scientific computing7.0
redhat enterprise linux server7.0
redhat enterprise linux workstation7.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

n/a 389-ds-base
- 389-ds-base-1.3.10.2affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

+32

Same product

port389: all records

Other highest-scoring records for the same primary product.

CVE-2022-0918A vulnerability was discovered in the 389 Directory Server that allows an unauthenticated attacker with network access to the LDAP port to c
32Monitor
CVE-2021-3652A flaw was found in 389-ds-base.
26Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
almalinux:389-ds-base	1.4.3.23-14.module_el8.5.0+2628+c731dc97 · AlmaLinux:8	Package registry (OSV)
almalinux:389-ds-base-devel	1.4.3.23-14.module_el8.5.0+2628+c731dc97 · AlmaLinux:8	Package registry (OSV)
almalinux:389-ds-base-legacy-tools	1.4.3.23-14.module_el8.5.0+2628+c731dc97 · AlmaLinux:8	Package registry (OSV)
almalinux:389-ds-base-libs	1.4.3.23-14.module_el8.5.0+2628+c731dc97 · AlmaLinux:8	Package registry (OSV)
almalinux:389-ds-base-snmp	1.4.3.23-14.module_el8.5.0+2628+c731dc97 · AlmaLinux:8	Package registry (OSV)
almalinux:python3-lib389	1.4.3.23-14.module_el8.5.0+2628+c731dc97 · AlmaLinux:8	Package registry (OSV)
debian:389-ds-base	2.0.15-1 · Debian:12	Package registry (OSV)
opensuse:389-ds	1.4.4.19~git38.9951c1101-150300.3.17.1 · openSUSE:Leap 15.3	Package registry (OSV)
red hat:389-ds-base	0:1.3.10.2-15.el7_9 · Red Hat:enterprise_linux:7::client	Package registry (OSV)
red hat:389-ds-base-debuginfo	0:1.3.10.2-15.el7_9 · Red Hat:enterprise_linux:7::client	Package registry (OSV)
red hat:389-ds-base-debugsource	0:1.4.3.23-14.module+el8.5.0+14377+c731dc97 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:389-ds-base-devel	0:1.3.10.2-15.el7_9 · Red Hat:enterprise_linux:7::client	Package registry (OSV)
red hat:389-ds-base-legacy-tools	0:1.4.3.23-14.module+el8.5.0+14377+c731dc97 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:389-ds-base-legacy-tools-debuginfo	0:1.4.3.23-14.module+el8.5.0+14377+c731dc97 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:389-ds-base-libs	0:1.3.10.2-15.el7_9 · Red Hat:enterprise_linux:7::client	Package registry (OSV)
red hat:389-ds-base-libs-debuginfo	0:1.4.3.23-14.module+el8.5.0+14377+c731dc97 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:389-ds-base-snmp	0:1.3.10.2-15.el7_9 · Red Hat:enterprise_linux:7::client	Package registry (OSV)
red hat:389-ds-base-snmp-debuginfo	0:1.4.3.23-14.module+el8.5.0+14377+c731dc97 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:cockpit-389-ds	0:1.4.3.22-4.module+el8dsrv+13893+84b6c18c · Red Hat:directory_server:11.3::el8	Package registry (OSV)
red hat:python3-lib389	0:1.4.3.23-14.module+el8.5.0+14377+c731dc97 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
rocky linux:389-ds-base	0:1.4.3.23-14.module+el8.5.0+745+c5be6847 · Rocky Linux:8	Package registry (OSV)
suse:389-ds	1.4.4.19~git38.9951c1101-150300.3.17.1 · SUSE:Linux Enterprise Module for Server Applications 15 SP3	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: none
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: High

Weakness class (CWE)

CWE-415 · Double Free

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

Fix✗ → ✓Sep 28, 2026, 10:47 PM UTC

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records

Noroxi analysis

No Noroxi analysis for this record yet

We use this product, ask for help

Data sources and verification

CNA: redhat

CVE.org (CNA)Nov 3, 2025, 8:33 PM UTC
NVDJun 17, 2026, 12:19 AM UTC
FIRST EPSSSep 30, 2026, 12:00 AM UTC
OSV / GHSAOct 1, 2026, 3:23 AM UTC

Each line is when that source was last processed for this record.

You’re seeing every CVE. Add your stack to narrow the list down to the ones that affect you.

Add your stack

Ecosystem	Package	Affected range	Fix
AlmaLinux:8	389-ds-base	before 1.4.3.23-14.module_el8.5.0+2628+c731dc97	1.4.3.23-14.module_el8.5.0+2628+c731dc97
AlmaLinux:8	389-ds-base-devel	before 1.4.3.23-14.module_el8.5.0+2628+c731dc97	1.4.3.23-14.module_el8.5.0+2628+c731dc97
AlmaLinux:8	389-ds-base-legacy-tools	before 1.4.3.23-14.module_el8.5.0+2628+c731dc97	1.4.3.23-14.module_el8.5.0+2628+c731dc97
AlmaLinux:8	389-ds-base-libs	before 1.4.3.23-14.module_el8.5.0+2628+c731dc97	1.4.3.23-14.module_el8.5.0+2628+c731dc97
AlmaLinux:8	389-ds-base-snmp	before 1.4.3.23-14.module_el8.5.0+2628+c731dc97	1.4.3.23-14.module_el8.5.0+2628+c731dc97
AlmaLinux:8	python3-lib389	before 1.4.3.23-14.module_el8.5.0+2628+c731dc97	1.4.3.23-14.module_el8.5.0+2628+c731dc97
Debian:10	389-ds-base	before 1.4.0.21-1+deb10u1	1.4.0.21-1+deb10u1
Debian:11	389-ds-base	before 1.4.4.11-2+deb11u1	1.4.4.11-2+deb11u1
Debian:12	389-ds-base	before 2.0.15-1	2.0.15-1
Red Hat:directory_server:11.3::el8	389-ds-base	before 0:1.4.3.22-4.module+el8dsrv+13893+84b6c18c	0:1.4.3.22-4.module+el8dsrv+13893+84b6c18c
Red Hat:directory_server:11.3::el8	389-ds-base-debuginfo	before 0:1.4.3.22-4.module+el8dsrv+13893+84b6c18c	0:1.4.3.22-4.module+el8dsrv+13893+84b6c18c
Red Hat:directory_server:11.3::el8	389-ds-base-debugsource	before 0:1.4.3.22-4.module+el8dsrv+13893+84b6c18c	0:1.4.3.22-4.module+el8dsrv+13893+84b6c18c
Red Hat:directory_server:11.3::el8	389-ds-base-devel	before 0:1.4.3.22-4.module+el8dsrv+13893+84b6c18c	0:1.4.3.22-4.module+el8dsrv+13893+84b6c18c
Red Hat:directory_server:11.3::el8	389-ds-base-legacy-tools	before 0:1.4.3.22-4.module+el8dsrv+13893+84b6c18c	0:1.4.3.22-4.module+el8dsrv+13893+84b6c18c
Red Hat:directory_server:11.3::el8	389-ds-base-legacy-tools-debuginfo	before 0:1.4.3.22-4.module+el8dsrv+13893+84b6c18c	0:1.4.3.22-4.module+el8dsrv+13893+84b6c18c
Red Hat:directory_server:11.3::el8	389-ds-base-libs	before 0:1.4.3.22-4.module+el8dsrv+13893+84b6c18c	0:1.4.3.22-4.module+el8dsrv+13893+84b6c18c
Red Hat:directory_server:11.3::el8	389-ds-base-libs-debuginfo	before 0:1.4.3.22-4.module+el8dsrv+13893+84b6c18c	0:1.4.3.22-4.module+el8dsrv+13893+84b6c18c
Red Hat:directory_server:11.3::el8	389-ds-base-snmp	before 0:1.4.3.22-4.module+el8dsrv+13893+84b6c18c	0:1.4.3.22-4.module+el8dsrv+13893+84b6c18c
Red Hat:directory_server:11.3::el8	389-ds-base-snmp-debuginfo	before 0:1.4.3.22-4.module+el8dsrv+13893+84b6c18c	0:1.4.3.22-4.module+el8dsrv+13893+84b6c18c
Red Hat:directory_server:11.3::el8	cockpit-389-ds	before 0:1.4.3.22-4.module+el8dsrv+13893+84b6c18c	0:1.4.3.22-4.module+el8dsrv+13893+84b6c18c
Red Hat:directory_server:11.3::el8	python3-lib389	before 0:1.4.3.22-4.module+el8dsrv+13893+84b6c18c	0:1.4.3.22-4.module+el8dsrv+13893+84b6c18c
Red Hat:enterprise_linux:7::client	389-ds-base	before 0:1.3.10.2-15.el7_9	0:1.3.10.2-15.el7_9
Red Hat:enterprise_linux:7::client	389-ds-base-debuginfo	before 0:1.3.10.2-15.el7_9	0:1.3.10.2-15.el7_9
Red Hat:enterprise_linux:7::client	389-ds-base-devel	before 0:1.3.10.2-15.el7_9	0:1.3.10.2-15.el7_9