CVE-2021-34294

Code execution via out-of-bounds GIF buffer read

Published Jul 13, 2021 · Updated Aug 4, 2024

Out-of-bounds read in Gif_loader.dll before 13.2 allows remote attackers to execute code via GIF files in Siemens JT2Go and Teamcenter Visualization. The library fails to validate attacker-controlled GIF data before reading beyond allocated buffer boundaries during parsing. Exploitation requires a user to open the file or visit a page that supplies it, and resulting code runs in the context of the current process.

CVSS severity7.8
High
EPSS probability1.66%
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 read in Gif_loader.dll before 13.2 allows remote attackers to execute code via GIF files in Siemens JT2Go and Teamcenter Visualization. The library fails to validate attacker-controlled GIF data before reading beyond allocated buffer boundaries during parsing. Exploitation requires a user to open the file or visit a page that supplies it, and resulting code runs in the context of the current process.

The record

CVE
CVE-2021-34294
Published
Jul 13, 2021
Updated
Aug 4, 2024
Vendor
Siemens
Product
Teamcenter Visualization
Classifications
CWE-20, CWE-125, T1204.002, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=All versions < V13.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Siemens · Teamcenter Visualizationversion=All versions < V13.2
Siemens · JT2Goversion=All versions < V13.2

Published CVSS scores

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
7.8NIST NVDCVSS: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 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-20Improper Input Validation
CWE-125Out-of-bounds Read
T1204.002User Execution: Malicious File
T1203Exploitation for Client Execution

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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