What is CVE-2013-3946?

CVE-2013-3946 is a high-severity vulnerability in Extensis Mrsid, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2020-01-02.

How severe is CVE-2013-3946?

High severity. CVSS v3 base score is 7.8 out of 10.

Buffer overflow in Extensis Mrsid

CVE-2013-3946

Heap-based buffer overflow in the MrSID plugin (MrSID.dll) before 4.37 for IrfanView allows remote attackers to execute arbitrary code via a levels header.

Vulnerability class: Buffer Overflow

Published 2020-01-02 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.025 (84.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 84.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.025 · newest: 0.025 · change: 0.000

Affected products

Extensis Mrsid
Irfanview Mrsid Plugin — versions before 4.37

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

exchange.xforce.ibmcloud.com/vulnerabilities/89806 (VDB Entry, Third Party Advisory)
www.irfanview.com/history_old.htm (Release Notes)

Frequently asked questions

What is CVE-2013-3946?: CVE-2013-3946 is a high-severity vulnerability in Extensis Mrsid, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2020-01-02.
How severe is CVE-2013-3946?: High severity. CVSS v3 base score is 7.8 out of 10.