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CVE-2019-3883· NVD / CVE Program· CNA redhat

In 389-ds-base up to version 1.4.1.2, requests are handled by workers threads.

In 389-ds-base up to version 1.4.1.2, requests are handled by workers threads. Each sockets will be waited by the worker for at most 'ioblocktimeout' seconds. However this timeout applies only for un-encrypted requests. Connections using SSL/TLS are not taking this timeout into account during reads, and may hang longer.An unauthenticated attacker could repeatedly create hanging LDAP requests to hang all the workers, resulting in a Denial of Service.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Apr 17, 2019
Updated
Jun 16, 2026
EPSS
8.2% · 95th percentile
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Report tools

JSON

Action score

32

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
2 / 30 · 8.2%

CNA vs NVD score

NVD
7.5
CNA · redhat
5.3
2.2 point gap

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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Affected systems

VendorProduct
fedoraproject389 directory server
debiandebian linux
redhatenterprise linux

Affected versions

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

  • debian debian linux8.0
  • fedoraproject 389 directory serverup to 1.4.1.2 inclusive
  • redhat enterprise linux6.0

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.

  • Red Hat 389-ds-base

    • affects up to 1.4.1.2affected

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:10389-ds-basebefore 1.4.0.21-1+deb10u11.4.0.21-1+deb10u1
Debian:12389-ds-basebefore 1.4.1.5-11.4.1.5-1
Debian:8389-ds-basebefore 1.3.3.5-4+deb8u61.3.3.5-4+deb8u6
Red Hat:enterprise_linux:7::client389-ds-basebefore 0:1.3.8.4-25.1.el7_60:1.3.8.4-25.1.el7_6
Red Hat:enterprise_linux:7::client389-ds-base-debuginfobefore 0:1.3.8.4-25.1.el7_60:1.3.8.4-25.1.el7_6
Red Hat:enterprise_linux:7::client389-ds-base-develbefore 0:1.3.8.4-25.1.el7_60:1.3.8.4-25.1.el7_6
Red Hat:enterprise_linux:7::client389-ds-base-libsbefore 0:1.3.8.4-25.1.el7_60:1.3.8.4-25.1.el7_6
Red Hat:enterprise_linux:7::client389-ds-base-snmpbefore 0:1.3.8.4-25.1.el7_60:1.3.8.4-25.1.el7_6
Red Hat:enterprise_linux:8::appstream389-ds-basebefore 0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f
Red Hat:enterprise_linux:8::appstream389-ds-base-debuginfobefore 0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f
Red Hat:enterprise_linux:8::appstream389-ds-base-debugsourcebefore 0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f
Red Hat:enterprise_linux:8::appstream389-ds-base-develbefore 0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f
Red Hat:enterprise_linux:8::appstream389-ds-base-legacy-toolsbefore 0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f
Red Hat:enterprise_linux:8::appstream389-ds-base-legacy-tools-debuginfobefore 0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f
Red Hat:enterprise_linux:8::appstream389-ds-base-libsbefore 0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f
Red Hat:enterprise_linux:8::appstream389-ds-base-libs-debuginfobefore 0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f
Red Hat:enterprise_linux:8::appstream389-ds-base-snmpbefore 0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f
Red Hat:enterprise_linux:8::appstream389-ds-base-snmp-debuginfobefore 0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f
Red Hat:enterprise_linux:8::appstreampython3-lib389before 0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f
SUSE:Linux Enterprise Module for Server Applications 15389-dsbefore 1.4.0.26~git0.8a2d3de6f-4.14.11.4.0.26~git0.8a2d3de6f-4.14.1

Same product

fedoraproject: all records

Other highest-scoring records for the same primary product.

  • CVE-2017-7551389-ds-base version before 1.3.5.19 and 1.3.6.7 are vulnerable to password brute-force attacks during account lockout due to different retur
    39Monitor
  • CVE-2017-15135It was found that 389-ds-base since 1.3.6.1 up to and including 1.4.0.3 did not always handle internal hash comparison operations correctly
    33Monitor
  • CVE-2018-14648A flaw was found in 389 Directory Server.
    32Monitor
  • CVE-2018-14638A flaw was found in 389-ds-base before version 1.3.8.4-13.
    31Monitor
  • CVE-2018-14624A vulnerability was discovered in 389-ds-base through versions 1.3.7.10, 1.3.8.8 and 1.4.0.16.
    31Monitor
  • CVE-2018-1089389-ds-base before versions 1.4.0.9, 1.3.8.1, 1.3.6.15 did not properly handle long search filters with characters needing escapes, possibly
    31Monitor

Remediation

Which version to upgrade to

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

Product / packageFixed versionSource
debian:389-ds-base1.4.1.5-1 · Debian:12Package registry (OSV)
red hat:389-ds-base0:1.3.8.4-25.1.el7_6 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:389-ds-base-debuginfo0:1.3.8.4-25.1.el7_6 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:389-ds-base-debugsource0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:389-ds-base-devel0:1.3.8.4-25.1.el7_6 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:389-ds-base-legacy-tools0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:389-ds-base-legacy-tools-debuginfo0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:389-ds-base-libs0:1.3.8.4-25.1.el7_6 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:389-ds-base-libs-debuginfo0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:389-ds-base-snmp0:1.3.8.4-25.1.el7_6 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:389-ds-base-snmp-debuginfo0:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:python3-lib3890:1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
suse:389-ds1.4.0.26~git0.8a2d3de6f-4.14.1 · SUSE:Linux Enterprise Module for Server Applications 15Package 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-772 · Missing Release of Resource after Effective Lifetime

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.

Attack patterns (CAPEC)

Change log

  1. Fix✗ → ✓

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