TI-2021-04858 Aliases CVE-2021-21813 GHSA-h458-372j-6g45

Out-of-bounds write in AT&T

LOW 34CWE-787Published 2021-08-13 · Updated 2024-08-03

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

Within the function HandleFileArg the argument filepattern is under control of the user who passes it in from the command line. filepattern is passed directly to memcpy copying the path provided by the user into a staticly sized buffer without any length checks resulting in a stack-buffer overflow.

Why it matters now

EPSS 0.00333 26th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	AT&T	AT&T Labs Xmill 0.7	—	No fix listed	CNA

AT&T Vendor— Affected AT&T Labs Xmill 0.7 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:att:xmill:0.7:::::::*	0.7	Vulnerable	AT&T

cpe:2.3:a:att:xmill:0.7:*:*:*:*:*:*:* Versions 0.7 Vulnerable ·AT&T

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-21813
2026-10-03 Alias added: GHSA-h458-372j-6g45

References

Exploit 1

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1280

TI-2022-09848 A heap-based buffer overflow exists in XML Decompression DecodeTreeBlock in AT&T Labs… CVSS 3.1CRITICAL 9.8
TI-2021-04874 Heap-based buffer overflow in AT&T CVSS 3.1CRITICAL 9.8
TI-2021-04875 Heap-based buffer overflow in AT&T CVSS 3.1CRITICAL 9.8
TI-2021-04870 Heap-based buffer overflow in AT&T CVSS 3.1CRITICAL 9.8
TI-2021-04873 Buffer overflow in AT&T CVSS 3.1CRITICAL 9.8
TI-2021-04872 Buffer overflow in AT&T CVSS 3.1CRITICAL 9.8

See all 12 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences