CVE•Published 2021-07-20•Modified 2026-10-14•1 article on news•6 live references•NVD data
CVE-2021-33910Systemd_project · Systemd
Vulnerability data via NVD (ingested)
CVSS v3.1
5.5
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS percentile
95
Exploit Prediction Scoring System · top 5% of all CVEs
Weaknesses (CWE)
Description
basic/unit-name.c in systemd prior to 246.15, 247.8, 248.5, and 249.1 has a Memory Allocation with an Excessive Size Value (involving strdupa and alloca for a pathname controlled by a local attacker) that results in an operating system crash.
Timeline
Published 2021-07-20
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 tag0 hosts
vuln:CVE-2021-33910Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Systemd Project Systemd"All exposed Systemd Project Systemd instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Systemd"HTTP body or banner mentions "Systemd" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2021-33910Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2021-33910Censys host search filtered to this CVE id.
grep.app
CVE-2021-33910Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2021-33910GitHub code search for direct mentions.
Google dork
"CVE-2021-33910" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.