CVE-2021-44961Public exploit

Memory exhaustion via unreleased extrusion clones

Published Mar 1, 2022 · Updated Jul 9, 2026

Memory leak in Slic3r libslic3r 1.3.0 and master commit b1a5500 allows attackers to exhaust memory via a crafted STL file. PerimeterGenerator::process appends cloned extrusion paths whose allocated copies are not released when the generator is destroyed. Opening or processing the attacker-supplied model is required; the resulting growth depletes available memory and interrupts Slic3r, with no reported data exposure or modification.

CVSS severity5.5
Medium
EPSS probability0.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in Slic3r libslic3r 1.3.0 and master commit b1a5500 allows attackers to exhaust memory via a crafted STL file. PerimeterGenerator::process appends cloned extrusion paths whose allocated copies are not released when the generator is destroyed. Opening or processing the attacker-supplied model is required; the resulting growth depletes available memory and interrupts Slic3r, with no reported data exposure or modification.

The record

CVE
CVE-2021-44961
Published
Mar 1, 2022
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-401, T1499.004, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 1, 2022CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record 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

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/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 exploitPublished

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499.004Application or System Exploitation
T1204.002User Execution Malicious File

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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