PT-2021-5544 · Openldap+6 · Openldap+6
Padma81
·
Published
2021-02-14
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Updated
2025-08-24
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CVE-2021-27212
CVSS v2.0
7.8
High
| Vector | AV:N/AC:L/Au:N/C:N/I:N/A:C |
Name of the Vulnerable Software and Affected Versions
OpenLDAP versions 2.4.57 and 2.5.x through 2.5.1alpha
Description
The issue is related to an assertion failure in the
issuerAndThisUpdateCheck function, which can occur via a crafted packet with a short timestamp, resulting in a denial of service (daemon exit). This is related to schema init.c and checkTime. The vulnerability can be exploited by a remote attacker, allowing them to send a specially crafted packet to slapd and execute a denial of service attack.Recommendations
For OpenLDAP versions 2.4.57 and 2.5.x through 2.5.1alpha, consider disabling the
issuerAndThisUpdateCheck function as a temporary workaround until a patch is available. Restrict access to the schema init.c and checkTime components to minimize the risk of exploitation. Avoid using crafted packets with short timestamps in the affected API endpoint until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.Exploit
DoS
Assertion Failure
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Astra Linux
Linuxmint
Openldap
Red Os
Suse
Ubuntu