uClibc-ng Integer Overflow or Wraparound
Priority MEDIUM 51CWE-190Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-190 and the CVSS impact.
Summary
uClibc-ng versions prior to 1.0.37 are vulnerable to integer wrap-around in functions malloc-simple. This improper memory assignment can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01721 77th percentileScored 2026-11-07
Fix Fixed uClibc-ng (uClibc-ng): 1.0.37
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| uClibc-ng | uClibc-ng | before 1.0.37 | 1.0.37 | Patch available | CNA |
- uClibc-ng VendoruClibc-ng Affected before 1.0.37 Fixed in 1.0.37 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:uclibc-ng_project:uclibc-ng:*:*:*:*:*:*:*:* | before 1.0.37 | Vulnerable | Uclibc-ng Project |
- cpe:2.3:a:uclibc-ng_project:uclibc-ng:*:*:*:*:*:*:*:* Versions before 1.0.37 Vulnerable ·Uclibc-ng Project
Remediation
- Fix · CNA uClibc-ng (uClibc-ng) Fixed in 1.0.37
Timeline
- 2026-10-02 Threatist record created from CVE-2021-27419
- 2026-10-03 Alias added: GHSA-499x-cvfw-94w6
References
More Uclibc-ng Project Uclibc-ng vulnerabilities
- TI-2022-11964 Memory corruption in Anker Eufy Homebase 2 CVSS 3.1CRITICAL 9.8
- TI-2021-19416 In uClibc and uClibc-ng before 1.0.39, incorrect handling of special characters in domain… CVSS 3.1CRITICAL 9.6
- TI-2022-12530 uClibc-ng through 1.0.40 and uClibc through 0.9.33.2 use predictable DNS transaction IDs… CVSS 3.1MEDIUM 6.5
- TI-2016-05366 Integer signedness error in libc/string/arm/memset.S in uClibc and uClibc-ng before… CVSS 3.1HIGH 7.5
- TI-2016-02030 The __read_etc_hosts_r function in libc/inet/resolv.c in uClibc-ng before 1.0.12 allows… CVSS 3.0HIGH 7.5
- TI-2016-02029 The __decode_dotted function in libc/inet/resolv.c in uClibc-ng before 1.0.12 allows… CVSS 3.0HIGH 7.5
Sources
- CVE-2021-27419 · CVE Program
- CVE-2021-27419 · NVD
- FIRST EPSS
- GHSA-499x-cvfw-94w6 · GitHub Advisory Database · CC BY 4.0
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