CVE-2021-33834: insyde h2offt Out-of-bounds Write
CVSS: 7.1v3.1HighModified
Published 08-09-2023Last modified 26-09-2024
Vulnerability summary
CVE-2021-33834 is a high (CVSS 7.1) Out-of-bounds Write vulnerability in insyde h2offt. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 8% of scored vulnerabilities.
CVSS score
7.1/10
010
High · v3.1 (NVD)EPSS score
0.19%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 08-09-2023PublishedVulnerability first disclosed.
- 26-09-2024Last modifiedVulnerability information updated.
Description
An issue was discovered in iscflashx64.sys 3.9.3.0 in Insyde H2OFFT 6.20.00. When handling IOCTL 0x22229a, the input used to allocate a buffer and copy memory is mishandled. This could cause memory corruption or a system crash.
CVSS metrics
1 score · 1 source · 1 versionHigh 7.1Preferred score · NVD (NIST)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:HSourcesSingle source
EPSS trend
Probability
0.19%
Chance of exploitation in the next 30 days
Percentile
8%
Versus all other CVEs
30-day change
0.00 pp
From 0.19% on 20-09-2026
20-09-202620-10-2026
EPSS score0.19%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Insyde2 products
- h2offt6.20.00
- iscflashx64.sys3.9.3.0
1 vendor · 2 products
References
2 links- www.insyde.com/security-pledgeNot Applicable
- www.insyde.com/security-pledge/SA-2021004Vendor Advisory