CVE•Published 2021-07-22•Modified 2026-10-14•1 article on news•5 live references•NVD data

CVE-2021-35942Gnu · Glibc

Vulnerability data via NVD (ingested)

CVSS v3.1

9.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

EPSS percentile

Exploit Prediction Scoring System · top 15% of all CVEs

Weaknesses (CWE)

CWE-190Integer Overflow or Wraparound CWE-704Incorrect Type Conversion or Cast

Description

The wordexp function in the GNU C Library (aka glibc) through 2.33 may crash or read arbitrary memory in parse_param (in posix/wordexp.c) when called with an untrusted, crafted pattern, potentially resulting in a denial of service or disclosure of information. This occurs because atoi was used but strtoul should have been used to ensure correct calculations.

Timeline

Published 2021-07-22

Modified 2026-10-14

External references

NVD MITRE Exploit-DB trickest/cve VulnCheck

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-2021-35942

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Gnu Glibc"

All exposed Gnu Glibc instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Glibc"

HTTP body or banner mentions "Glibc" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2021-35942