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Fencer Intel
high 7.5

CVE-2017-17740 json

contrib/slapd-modules/nops/nops.c in OpenLDAP through 2.4.45, when both the nops module and the memberof overlay are enabled, attempts to f…

published 2017-12-18 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-8892

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
7.0%
EPSS 7.0% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

contrib/slapd-modules/nops/nops.c in OpenLDAP through 2.4.45, when both the nops module and the memberof overlay are enabled, attempts to free a buffer that was allocated on the stack, which allows remote attackers to cause a denial of service (slapd crash) via a member MODDN operation.

Patch / fix

  • oracle blockchain_platform 21.1.2
  • mcafee policy_auditor 6.5.1
  • openldap2 SLE Module for Legacy 15 SP1, SLE Module for Legacy 15, SLE Module for Development Tools 15 SP1 +3 more 2.4.46-9.19.2
  • openldap2 SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES for SAP 12 SP2 +5 more 2.4.41-18.24.9.7
  • openldap2 SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES 12 SP4 +5 more 2.4.41-18.43.1
  • openldap2-client SLES for SAP 12 SP1, SLES for SAP 12, SLES 12-LTSS +1 more 2.4.41-18.24.9.1

suse advisories SUSE-SU-2019:2395-1SUSE-SU-2019:0931-1SUSE-SU-2018:4150-1

  • openldap2 openSUSE Leap 15.0 2.4.46-lp150.13.1
  • openldap2 openSUSE Leap 15.1 2.4.46-lp151.10.3.1

opensuse advisories openSUSE-SU-2019:2176-1openSUSE-SU-2019:2157-1

  • openldap Alpine 3.24, Alpine 3.23, Alpine 3.22 +15 more 2.4.46-r0

alpine advisories ALPINE-CVE-2017-17740

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2017-17740 updated cvss 5.9

openldap: contrib/slapd-modules/nops/nops.c attempts to free stack buffer allowing remote attackers to cause a denial of service

  • Red Hat JBoss Enterprise Application Platform 5 openldap
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux 5 openldap, openldap24-libs Red Hat Enterprise Linux 6 openldap, compat-openldap, openldap-clients, openldap-servers, openldap-servers-sql Red Hat Enterprise Linux 7 openldap, compat-openldap, openldap-clients, openldap-servers, openldap-servers-sql Red Hat Enterprise Linux 8 openldap, openldap-clients, openldap-servers Red Hat JBoss Core Services openldap Red Hat JBoss Enterprise Web Server 2 openldap
    +1 more products
    Red Hat JBoss Web Server 3 openldap
    not affected: vulnerable code not present

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

7.02% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
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

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Intel 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.