Description
An off-by-one error leading to a crash was discovered in openldap 2.4 when processing DNS SRV messages. If slapd was configured to use the dnssrv backend, an attacker could crash the service with crafted DNS responses.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| openldap | openldap | 2.4 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | openldap +4 | 2.4.40-8.el7 | RHSA-2015:2131 |
| RHEL 6 | openldap +4 | 2.4.40-5.el6 | RHBA-2015:1292 |
Advisories 2
- RHSA-2015:2131 Red Hat Security Advisory: openldap security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHBA-2015:1292 Red Hat Bug Fix Advisory: openldap bug fix and enhancement update Red Hat Security Advisories (RHSA) · Jun 26, 2026