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Fencer Vulns
medium 5.3

CVE-2019-3883 json

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

published 2019-04-17 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-13493

cvss
5.3
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
8.2%
EPSS 8.2% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

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.

Patch / fix

  • 389-ds-base Debian 13, Debian 12 1.4.1.5-1

debian advisories DEBIAN-CVE-2019-3883

  • 389-ds-base RHEL 8 1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f
  • python3-lib389 RHEL 8 1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f
  • 389-ds-base-libs RHEL 8 1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f
  • 389-ds-base-snmp RHEL 8 1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f
  • 389-ds-base-legacy-tools RHEL 8 1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f
  • 389-ds-base RHEL 7 1.3.8.4-25.1.el7_6
  • 389-ds-base-libs RHEL 7 1.3.8.4-25.1.el7_6
  • 389-ds-base-snmp RHEL 7 1.3.8.4-25.1.el7_6

red hat advisories RHSA-2019:3401RHSA-2019:1896

  • 389-ds SLE Module for Server Applications 15 SP1, SLE Module for Server Applications 15 1.4.0.26~git0.8a2d3de6f-4.14.1

suse advisories SUSE-SU-2019:2155-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-3883 updated cvss 5.3

389-ds-base: DoS via hanging secured connections

  • Red Hat Enterprise Linux 6 389-ds-base, 389-ds-base-libs
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux AppStream (v. 8) 389-ds-base 1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f, python3-lib389 1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f, 389-ds-base-libs 1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f, 389-ds-base-snmp 1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f, 389-ds-base-legacy-tools 1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f
    fixed: vendor fix RHSA-2019:3401
  • Red Hat Enterprise Linux Client Optional (v. 7) 389-ds-base 1.3.8.4-25.1.el7_6, 389-ds-base-libs 1.3.8.4-25.1.el7_6, 389-ds-base-snmp 1.3.8.4-25.1.el7_6 Red Hat Enterprise Linux ComputeNode Optional (v. 7) 389-ds-base 1.3.8.4-25.1.el7_6, 389-ds-base-libs 1.3.8.4-25.1.el7_6, 389-ds-base-snmp 1.3.8.4-25.1.el7_6 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) 389-ds-base 1.3.8.4-25.1.el7_6, 389-ds-base-libs 1.3.8.4-25.1.el7_6 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) 389-ds-base 1.3.8.4-25.1.el7_6, 389-ds-base-libs 1.3.8.4-25.1.el7_6, 389-ds-base-snmp 1.3.8.4-25.1.el7_6 Red Hat Enterprise Linux Server (v. 7) 389-ds-base 1.3.8.4-25.1.el7_6, 389-ds-base-libs 1.3.8.4-25.1.el7_6 Red Hat Enterprise Linux Server Optional (v. 7) 389-ds-base 1.3.8.4-25.1.el7_6, 389-ds-base-libs 1.3.8.4-25.1.el7_6, 389-ds-base-snmp 1.3.8.4-25.1.el7_6
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 7) 389-ds-base 1.3.8.4-25.1.el7_6, 389-ds-base-libs 1.3.8.4-25.1.el7_6 Red Hat Enterprise Linux Workstation Optional (v. 7) 389-ds-base-snmp 1.3.8.4-25.1.el7_6
    fixed: vendor fix RHSA-2019:1896

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

8.20% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 5.3 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • Red Hat 389-ds-base

Classification

Weakness
  • CWE-772 Missing Release of Resource after Effective Lifetime

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.