CVE-2020-21675Public exploit

Converter crash via genptk_text stack-buffer overwrite

Published Aug 10, 2021 · Updated Aug 4, 2024

Stack-based buffer overflow in Fig2dev Project fig2dev 3.2.7b allows attackers to crash the converter via a crafted Xfig file. While generating PTK output, genptk_text in genptk.c writes a byte beyond the 2,048-byte stfp stack buffer when processing file content. A user must cause the crafted file to be converted to PTK; the demonstrated consequence is process termination, not code execution.

CVSS severity5.5
Medium
EPSS probability1.06%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Fig2dev Project fig2dev 3.2.7b allows attackers to crash the converter via a crafted Xfig file. While generating PTK output, genptk_text in genptk.c writes a byte beyond the 2,048-byte stfp stack buffer when processing file content. A user must cause the crafted file to be converted to PTK; the demonstrated consequence is process termination, not code execution.

The record

CVE
CVE-2020-21675
Published
Aug 10, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, CWE-121, T1499, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 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?

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

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

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

CWE-787Out-of-bounds Write
CWE-121Stack-based Buffer Overflow
T1499Endpoint Denial of Service
T1204.002Malicious 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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