CVE-2025-46269

Code execution via malformed VC6 file parsing

Published Aug 18, 2025 · Updated Aug 19, 2025

Heap-based buffer overflow in Ashlar-Vellum products before 12.6.1204.204 allows context-dependent attackers to execute arbitrary code. The VC6 file parser insufficiently validates user-supplied file data before processing it in heap memory, allowing a crafted file to overrun a heap buffer. Exploitation requires a user to open or import the malicious file, after which code runs with the privileges of the affected application.

CVSS severity8.4
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in Ashlar-Vellum products before 12.6.1204.204 allows context-dependent attackers to execute arbitrary code. The VC6 file parser insufficiently validates user-supplied file data before processing it in heap memory, allowing a crafted file to overrun a heap buffer. Exploitation requires a user to open or import the malicious file, after which code runs with the privileges of the affected application.

The record

CVE
CVE-2025-46269
Published
Aug 18, 2025
Updated
Aug 19, 2025
Vendor
Ashlar-Vellum
Product
Cobalt
Classifications
CWE-122, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <12.6.1204.204

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Ashlar-Vellum · Cobaltversion=0 <12.6.1204.204
Ashlar-Vellum · Cobalt Shareversion=0 <12.6.1204.204
Ashlar-Vellum · Xenonversion=0 <12.6.1204.204
Ashlar-Vellum · Argonversion=0 <12.6.1204.204
Ashlar-Vellum · Lithium CADversion=0 <12.6.1204.204

Published CVSS scores

8.4CISA ICS-CERTCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.8CISA ICS-CERTCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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