CVE-2023-34293

Code execution via unchecked X_B or X_T parsing

Published May 3, 2024 · Updated Sep 18, 2024

Out-of-bounds write in Ashlar-Vellum Cobalt before 12.0.1204.54 allows remote attackers to execute code via crafted X_B or X_T files. The X_B and X_T parsers fail to validate user-supplied data before writing it past the end of an allocated buffer. Execution occurs in the current process only after a user visits a malicious page or opens a malicious file.

CVSS severity8.8
High
EPSS probability0.76%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Ashlar-Vellum Cobalt before 12.0.1204.54 allows remote attackers to execute code via crafted X_B or X_T files. The X_B and X_T parsers fail to validate user-supplied data before writing it past the end of an allocated buffer. Execution occurs in the current process only after a user visits a malicious page or opens a malicious file.

The record

CVE
CVE-2023-34293
Published
May 3, 2024
Updated
Sep 18, 2024
Vendor
Ashlar-Vellum
Product
Cobalt
Classifications
CWE-787, T1203, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2024Record 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 <12.0.1204.54
  2. Affected versionversion=Ashlar-Vellum Cobalt 12 beta build 1204.49

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Ashlar-Vellum · Cobaltversion=0 <12.0.1204.54; version=Ashlar-Vellum Cobalt 12 beta build 1204.49

Published CVSS scores

7.0Zero Day InitiativeCVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8NIST NVDCVSS:3.1/AV:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution
T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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