CVE•Published 2021-02-14•Modified 2026-10-14•1 article on news•5 live references•NVD data
CVE-2021-27212Openldap · Openldap
Vulnerability data via NVD (ingested)
CVSS v3.1
7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS percentile
99
Exploit Prediction Scoring System · top 1% of all CVEs
Weaknesses (CWE)
Description
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.
Timeline
Published 2021-02-14
Modified 2026-10-14
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag3 hosts
vuln:CVE-2021-27212Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Openldap Openldap"All exposed Openldap Openldap instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Openldap"HTTP body or banner mentions "Openldap" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2021-27212Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2021-27212Censys host search filtered to this CVE id.
grep.app
CVE-2021-27212Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2021-27212GitHub code search for direct mentions.
Google dork
"CVE-2021-27212" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.