CVE-2022-29503Public exploitNetwork attack vector

Memory corruption via fixed-address thread stack mapping

Published Sep 29, 2022 · Updated Apr 15, 2025

Memory corruption in uClibC 0.9.33.2 and uClibC-ng 1.0.40 allows attackers to overwrite process mappings during thread creation. pthread_handle_create derives descending stack addresses, and pthread_allocate_stack passes them to mmap with MAP_FIXED, discarding overlapping mappings. Exploitation requires a path that creates many threads, especially in a 32-bit process, and can corrupt loaded libraries or application code.

CVSS severity8.1
High
EPSS probability1.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in uClibC 0.9.33.2 and uClibC-ng 1.0.40 allows attackers to overwrite process mappings during thread creation. pthread_handle_create derives descending stack addresses, and pthread_allocate_stack passes them to mmap with MAP_FIXED, discarding overlapping mappings. Exploitation requires a path that creates many threads, especially in a 32-bit process, and can corrupt loaded libraries or application code.

The record

CVE
CVE-2022-29503
Published
Sep 29, 2022
Updated
Apr 15, 2025
Vendor
uClibc-ng
Product
uClibc-ng
Classifications
CWE-770, CWE-119
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 29, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.40

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

uClibc-ng · uClibc-ngversion=1.0.40
Anker Innovations · eufy HomeBase 2version=2.1.8.8h
uClibc · uClibcversion=0.9.33.2

Published CVSS scores

8.1Cisco TalosCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer

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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