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Vulnerabilities

Vulnerability · CVE-2021-35942

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…

Published Jul 22, 2021 · catalog updated Oct 14, 2026 · the affected product

Last checked Oct 24, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2021-35942. EPSS is 2.75%. Act only if a listed version of the affected product is installed.

Gaps on this record

  • No plain product name is stored. The page cannot tell you which product to check.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Critical9.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
2.75%
Remediation
Advisory link
Affected products
cpe debian/debian linux · cpe gnu/glibc · cpe netapp/active iq unified manager · cpe netapp/e-series santricity os controller · cpe netapp/hci management node · cpe netapp/ontap select deploy administration utility

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe debian/debian linux10.0
  • cpe gnu/glibcversion unspecified
  • cpe netapp/active iq unified managerversion unspecified
  • cpe netapp/e-series santricity os controllerversion unspecified
  • cpe netapp/hci management nodeversion unspecified
  • cpe netapp/ontap select deploy administration utilityversion unspecified
  • cpe netapp/solidfireversion unspecified

How to fix CVE-2021-35942

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2021-35942. EPSS is 2.75%. Act only if a listed version of the affected product is installed.

Which versions are affected?

Compare what you have installed with debian/debian linux 10.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-190: Integer Overflow; CWE-704. EPSS 2.75%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 22, 2021 · NIST NVD

    Detected

    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.

  2. Oct 14, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2021-35942

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-35942

    30-day exploitation probability 2.75%

    first.org
  • NIST NVDVulnerability recordCVE-2021-35942

    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

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 24, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 24, 2026
  • CVE.orgOct 16, 2026
  • NIST NVDOct 14, 2026