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CVE-2021-27212 · cross-distro fix matrix

CVE-2021-27212: In OpenLDAP through 2.4.57 and 2.5.x through 2.5.1alpha, an assertion failure in slapd can occur in the issuerAndThisUpdateCheck function via a crafted packet, resulting in a denial of service (daemon exit) via a short timestamp. This is related to schema_init.c and checkTime.

Affects 8 Linux releases across 8 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2021-27212 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

  • openldap→ fixed in2.4.57+dfsg-2urgency: not yet assigned
    sudo apt-get install --only-upgrade -y openldap

Debian bookworm

Source: Debian Security Tracker

  • openldap→ fixed in2.4.57+dfsg-2urgency: not yet assigned
    sudo apt-get install --only-upgrade -y openldap

Debian trixie

Source: Debian Security Tracker

  • openldap→ fixed in2.4.57+dfsg-2urgency: not yet assigned
    sudo apt-get install --only-upgrade -y openldap

Alpine v3.20

Source: Alpine secdb

  • openldap→ fixed in2.4.57-r1
    apk update && apk add --upgrade openldap

Alpine v3.21

Source: Alpine secdb

  • openldap→ fixed in2.4.57-r1
    apk update && apk add --upgrade openldap

Alpine edge

Source: Alpine secdb

  • openldap→ fixed in2.4.57-r1
    apk update && apk add --upgrade openldap

Alpine v3.18

Source: Alpine secdb

  • openldap→ fixed in2.4.57-r1
    apk update && apk add --upgrade openldap

Alpine v3.19

Source: Alpine secdb

  • openldap→ fixed in2.4.57-r1
    apk update && apk add --upgrade openldap
Are YOU affected by CVE-2021-27212?

5-second check on your actual server. Reads /etc/os-release, uname -r, and the distro's package manager; matches against this same cross-source index live.

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