How severe is CVE-2022-26507?

CVE-2022-26507 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2022-26507 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-26507?

CVE-2022-26507 primarily affects Att Xmill. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2022-26507?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2022-26507 published?

CVE-2022-26507 was published on 2022-04-14 and last updated on 2026-06-17.

CVE-2022-26507

CVE-2022-26507 is a critical-severity vulnerability in Att Xmill with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Att Xmill
Published: 2022-04-14
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is 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
How severe is CVE-2022-26507?: CVE-2022-26507 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2022-26507 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-26507?: CVE-2022-26507 primarily affects Att Xmill. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2022-26507?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2022-26507 published?: CVE-2022-26507 was published on 2022-04-14 and last updated on 2026-06-17.

References

Affected products (5)

cpe:2.3:a:att:xmill:0.7:*:*:*:*:*:*:*
cpe:2.3:a:schneider-electric:ecostruxure_control_expert:*:*:*:*:*:*:*:*
cpe:2.3:a:schneider-electric:ecostruxure_control_expert:15.1:-:*:*:*:*:*:*
cpe:2.3:a:schneider-electric:ecostruxure_process_expert:*:*:*:*:*:*:*:*
cpe:2.3:a:schneider-electric:remoteconnect:-:*:*:*:*:*:*:*

More vulnerabilities in Att Xmill

CVE-2021-21811 — Critical (CVSS 9.8): A memory corruption vulnerability exists in the XML-parsing CreateLabelOrAttrib functionality of AT&T Labs’ Xmill…
CVE-2021-21828 — Critical (CVSS 9.8): A heap-based buffer overflow vulnerability exists in the XML Decompression DecodeTreeBlock functionality of AT&T Labs…
CVE-2021-21827 — Critical (CVSS 9.8): A heap-based buffer overflow vulnerability exists in the XML Decompression DecodeTreeBlock functionality of AT&T Labs…
CVE-2021-21826 — Critical (CVSS 9.8): A heap-based buffer overflow vulnerability exists in the XML Decompression DecodeTreeBlock functionality of AT&T Labs…
CVE-2021-21825 — Critical (CVSS 9.8): A heap-based buffer overflow vulnerability exists in the XML Decompression PlainTextUncompressor::UncompressItem…
CVE-2021-21810 — Critical (CVSS 9.8): A memory corruption vulnerability exists in the XML-parsing ParseAttribs functionality of AT&T Labs’ Xmill 0.7. A…

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