CVE-2021-37322Public exploit

Memory corruption via stale demangler array state

Published Nov 18, 2021 · Updated Aug 4, 2024

Use-after-free in GNU c++filt 2.26 allows context-dependent attackers to corrupt memory via crafted C++ symbols. In cplus-dem.c, squangle_mop_up frees btypevec and ktypevec but leaves their size fields nonzero, so later demangling writes through invalid storage. Exploitation requires a victim to process attacker-crafted input with c++filt; vendor assessments bound the consequence to memory disclosure, a utility crash, or code execution.

CVSS severity7.8
High
EPSS probability0.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in GNU c++filt 2.26 allows context-dependent attackers to corrupt memory via crafted C++ symbols. In cplus-dem.c, squangle_mop_up frees btypevec and ktypevec but leaves their size fields nonzero, so later demangling writes through invalid storage. Exploitation requires a victim to process attacker-crafted input with c++filt; vendor assessments bound the consequence to memory disclosure, a utility crash, or code execution.

The record

CVE
CVE-2021-37322
Published
Nov 18, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-416, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 18, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.5SUSECVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
6.8NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1204.002User Execution: Malicious File

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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