Buffer overflow in Hancom Office 2020
CVE-2021-21958
A heap-based buffer overflow vulnerability exists in the Hword HwordApp.dll functionality of Hancom Office 2020 11.0.0.2353. A specially-crafted malformed file can lead to memory corruption and potential arbitrary code execution. An attacker can provide a malicious file to trigger this vulnerability.
Vulnerability class: Buffer Overflow
Published · last modified .
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: 0.011 (64.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000
Affected products
- Hancom Office 2020 — versions 11.0.0.2353
- Hancom — versions Hancom Office 2020 11.0.0.2353
Weakness classification (CWE)
References
- talosintelligence.com/vulnerability_reports/TALOS-2021-1386 (Exploit, Third Party Advisory)
- blog.talosintelligence.com/2022/02/vuln-spotlight-.html (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-21958?
- CVE-2021-21958 is a high-severity vulnerability in Hancom Office 2020, classified under Heap-based Buffer Overflow. CVSS score: 7.8/10. Published 2022-02-16.
- How severe is CVE-2021-21958?
- High severity. CVSS v3 base score is 7.8 out of 10.