CVE-2023-34634Public exploit

Arbitrary code execution via crafted project-file deserialization

Published Aug 1, 2023 · Updated Oct 23, 2024

Insecure deserialization in Greenshot 1.2.10 and earlier allows attackers to execute arbitrary code by inducing a user to open a crafted .greenshot file. The file loader passes an appended .NET object stream to BinaryFormatter, allowing an attacker-controlled gadget chain to instantiate unsafe types during deserialization. Execution occurs with the Greenshot process permissions only after a user opens the file; the default Windows installation associates the file extension with Greenshot.

CVSS severity7.8
High
EPSS probability7.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insecure deserialization in Greenshot 1.2.10 and earlier allows attackers to execute arbitrary code by inducing a user to open a crafted .greenshot file. The file loader passes an appended .NET object stream to BinaryFormatter, allowing an attacker-controlled gadget chain to instantiate unsafe types during deserialization. Execution occurs with the Greenshot process permissions only after a user opens the file; the default Windows installation associates the file extension with Greenshot.

The record

CVE
CVE-2023-34634
Published
Aug 1, 2023
Updated
Oct 23, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 23, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NVDCVSS: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.

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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 exploitPublished

Weakness, pattern, technique

T1203Exploitation for Client Execution

Public exploit references

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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