CVE-2022-26507

A heap-based buffer overflow exists in XML Decompression DecodeTreeBlock in AT&T Labs Xmill 0.7. A crafted input file can lead to remote code execution. This is not the same as any of: CVE-2021-21810, CVE-2021-21811, CVE-2021-21812, CVE-2021-21815, CVE-2021-21825, CVE-2021-21826, CVE-2021-21828, CVE-2021-21829, or CVE-2021-21830. NOTE: This vulnerability only affects products that are no longer supported by the maintainer

Published: 2022-04-14 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2022-26507 is rated High Risk (70.2/100): CVSS Critical severity, with high exploitation likelihood (EPSS 6.70%, 91th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2022-26507

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-08-16 7.54% 6.70% -0.85%
2 2025-08-13 8.75% 7.54% -1.20%
3 2025-08-12 — 8.75% —

Full EPSS history (17 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2022-26507

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2022-26507

Affected software / configurations for CVE-2022-26507

Vendor Product Version Raw CPE
att xmill 0.7 cpe:2.3:a:att:xmill:0.7:*:*:*:*:*:*:*
schneider-electric ecostruxure_control_expert < 15.1 cpe:2.3:a:schneider-electric:ecostruxure_control_expert:*:*:*:*:*:*:*:*
schneider-electric ecostruxure_control_expert 15.1 cpe:2.3:a:schneider-electric:ecostruxure_control_expert:15.1:-:*:*:*:*:*:*
schneider-electric ecostruxure_process_expert < 2021 cpe:2.3:a:schneider-electric:ecostruxure_process_expert:*:*:*:*:*:*:*:*
schneider-electric remoteconnect — cpe:2.3:a:schneider-electric:remoteconnect:-:*:*:*:*:*:*:*

References for CVE-2022-26507

URL Tags
https://Claroty.com Not Applicable Third Party Advisory
https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-222-02 Mitigation Release Notes Third Party Advisory
cvelogic Threat Intelligence