CVE•Published 2021-05-18•Modified 2026-10-14•1 article on news•6 live references•NVD data
CVE-2021-3518Xmlsoft · Libxml2
Vulnerability data via NVD (ingested)
CVSS v3.1
8.8
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS percentile
98
Exploit Prediction Scoring System · top 2% of all CVEs
Weaknesses (CWE)
Description
There's a flaw in libxml2 in versions before 2.9.11. An attacker who is able to submit a crafted file to be processed by an application linked with libxml2 could trigger a use-after-free. The greatest impact from this flaw is to confidentiality, integrity, and availability.
Timeline
Published 2021-05-18
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-2021-3518Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Xmlsoft Libxml2"All exposed Xmlsoft Libxml2 instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Libxml2"HTTP body or banner mentions "Libxml2" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2021-3518Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2021-3518Censys host search filtered to this CVE id.
grep.app
CVE-2021-3518Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2021-3518GitHub code search for direct mentions.
Google dork
"CVE-2021-3518" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub (3)
CVE-2021-35183 repos