CVE-2020-28595Network attack vector

Code execution via OBJ facet buffer overflow

Published Feb 10, 2021 · Updated Aug 4, 2024

Heap-based buffer overflow in PrusaSlicer 2.2.0 and commit 4b040b856 allows attackers to execute code via a crafted OBJ file. The load_obj() conversion loop can increment the facet index twice while allocation uses a lower face count, causing malformed vertex groups to write beyond the heap facet array. Execution requires a user to open the attacker-supplied OBJ file, and successful corruption runs code in the PrusaSlicer process.

CVSS severity8.8
High
EPSS probability1.47%
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 PrusaSlicer 2.2.0 and commit 4b040b856 allows attackers to execute code via a crafted OBJ file. The load_obj() conversion loop can increment the facet index twice while allocation uses a lower face count, causing malformed vertex groups to write beyond the heap facet array. Execution requires a user to open the attacker-supplied OBJ file, and successful corruption runs code in the PrusaSlicer process.

The record

CVE
CVE-2020-28595
Published
Feb 10, 2021
Updated
Aug 4, 2024
Vendor
Prusa Research
Product
PrusaSlicer
Classifications
CWE-122, T1204.002, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 10, 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

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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=Prusa Research PrusaSlicer 2.2.0 ,Prusa Research PrusaSlicer Master (commit 4b040b856)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Prusa Research · PrusaSlicerversion=Prusa Research PrusaSlicer 2.2.0 ,Prusa Research PrusaSlicer Master (commit 4b040b856)

Published CVSS scores

8.8Cisco TalosCVSS:3.0/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
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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