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01 Record

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, crafted pattern, potentially

CriticalPUBLISHEDCNA: mitre
CNA base score9.1 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
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02 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

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
2.75% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 85.9% of scored records. A rank, not a probability.
NVD base score
9.1 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-10-14.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2021-07-22 00:00Z5 YR AGO
Last updated
2026-10-14 11:48Z15 DAYS AGO
Reserved
2021-06-29
Assigning CNA
mitre
Record state
PUBLISHED
Severity
Critical (CVSS 9.1)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Weaknesses
  • CWE-704Incorrect Type Conversion or CastClass
  • CWE-190Integer Overflow or WraparoundBase
Data version
5.2
Document digest
a83f69b32c3e2ff83e809c8149fc911a1467b956efad42f4aa1d4cb78a8af264

05 Affected products

VendorProductVersionsPlatforms
debiandebian_linuxNot specified—
gnuglibcNot specified—
netappactive_iq_unified_managerNot specified—
netappe-series_santricity_os_controllerNot specified—
netapphci_management_nodeNot specified—
netappontap_select_deploy_administration_utilityNot specified—
netappsolidfireNot specified—
redhatenterprise_linuxNot specified—

06 References

07 Fixed in

AlmaLinux 8

  • compat-libpthread-nonshared
    Fixed in 2.28-164.el8
  • glibc-benchtests
    Fixed in 2.28-164.el8
  • glibc-nss-devel
    Fixed in 2.28-164.el8
  • glibc-static
    Fixed in 2.28-164.el8
  • glibc-utils
    Fixed in 2.28-164.el8
  • nss_hesiod
    Fixed in 2.28-164.el8

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Arch Linux

  • glibc
    Fixed in 2.34-1

Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.

CloudLinux 8

  • compat-libpthread-nonshared
    Fixed in 2.28-164.el8
  • glibc-benchtests
    Fixed in 2.28-164.el8
  • glibc-nss-devel
    Fixed in 2.28-164.el8
  • glibc-static
    Fixed in 2.28-164.el8
  • glibc-utils
    Fixed in 2.28-164.el8
  • nss_hesiod
    Fixed in 2.28-164.el8

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • glibc
    Fixed in 2.31-13

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • glibc
    Fixed in 2.31-13

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • glibc
    Fixed in 2.31-13

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

  • glibc
    Fixed in 2.27-3ubuntu1.5

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • glibc
    Fixed in 2.31-0ubuntu9.7

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 14.04 LTS

  • eglibc
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 16.04 LTS

  • glibc
    Fixed in 2.23-0ubuntu11.3+esm2
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.