A memory corruption vulnerability exists in the XML-parsing ParseAttribs functionality of AT&T Labs’ Xmill 0.7.

published 2021-08-17 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-8981

cvss: 8.1; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.1%; EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits: 0; none known

A memory corruption vulnerability exists in the XML-parsing ParseAttribs functionality of AT&T Labs’ Xmill 0.7. A specially crafted XML file can lead to a heap buffer overflow. An attacker can provide a malicious file to trigger this vulnerability.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-22-223-03 updated 2022-08-11 cvss 8.1

Schneider Electric EcoStruxure, EcoStruxure Process Expert, SCADAPack RemoteConnect for x70

Schneider Electric Software, LLC EcoStruxure Control Expert < 15.1 HF001 (including former Unity Pro) Schneider Electric Software, LLC EcoStruxure Process Expert < 2021 (including former HDCS) Schneider Electric Software, LLC SCADAPack RemoteConnect for x70 < R2.7.3
affected: mitigation “AT&T Labs have stated this software is longer supported and recommends vendors to move away from using it.” se.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

1.14% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

talosintelligence.com https://talosintelligence.com/vulnerability_reports/TALOS-2021-1278 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.0	8.1	CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

n/a AT&T Labs

Classification

Weakness

CWE-122 Heap-based Buffer Overflow
CWE-787 Out-of-bounds Write

References

talosintelligence.com /vulnerability_reports/TALOS-2021-1278
exploit, third-party-advisory

Sources

CVE List CVE-2021-21810
NVD CVE-2021-21810

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary