CVE-2021-33834 json
An issue was discovered in iscflashx64.sys 3.9.3.0 in Insyde H2OFFT 6.20.00.
published 2023-09-08 3 y ago modified 2026-06-17 4 mo ago also EUVD-2021-20508
- cvss
- 7.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 8%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 2 y ago
Exploit prediction
0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
Classification
- Weakness
-
- CWE-787 Out-of-bounds Write
References
-
insyde.com
/security-pledge/SA-2021004
vendor-advisory
-
insyde.com
/security-pledge
not-applicable
Sources
- CVE List CVE-2021-33834
- NVD CVE-2021-33834
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.