CVE•Published 2022-01-01•Modified 2026-10-14•1 article on news•5 live references•NVD data
CVE-2021-45960Libexpat_project · Libexpat
Vulnerability data via NVD (ingested)
CVSS v3.1
8.8
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS percentile
91
Exploit Prediction Scoring System · top 9% of all CVEs
Weaknesses (CWE)
Description
In Expat (aka libexpat) before 2.4.3, a left shift by 29 (or more) places in the storeAtts function in xmlparse.c can lead to realloc misbehavior (e.g., allocating too few bytes, or only freeing memory).
Timeline
Published 2022-01-01
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-2021-45960Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Libexpat Project Libexpat"All exposed Libexpat Project Libexpat instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Libexpat"HTTP body or banner mentions "Libexpat" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2021-45960Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2021-45960Censys host search filtered to this CVE id.
grep.app
CVE-2021-45960Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2021-45960GitHub code search for direct mentions.
Google dork
"CVE-2021-45960" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2021-45960 on GitHub.