CVE-2021-38575: insyde kernel Buffer Underwrite
Vulnerability summary
CVE-2021-38575 is a high (CVSS 8.1) Buffer Underwrite vulnerability in insyde kernel. EPSS estimates a 1.99% chance of exploitation in the next 30 days, higher than 80.7% of scored vulnerabilities. 1 public exploit is recorded.
Public exploit (reference, Date unknown)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 4 · Related 2Timeline
- 01-12-2021PublishedVulnerability first disclosed.
- 03-11-2025Last modifiedVulnerability information updated.
Description
NetworkPkg/IScsiDxe has remotely exploitable buffer overflows.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · Red hatEcosystem advisory · calculated8.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated8.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
1.99%
Chance of exploitation in the next 30 days
Percentile
81%
Versus all other CVEs
30-day change
No change 0.00 pp
From 1.99% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundExploit Reference (bugzilla.tianocore.org)
Maturity: unknown
Weaknesses
CWE · root cause- CWE-124Buffer UnderwriteThe product writes to a buffer using an index or pointer that references a memory location prior to the beginning of the buffer.
- CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferThe product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary.
Affected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat3 products
- edk2< 0:20190829git37eef91017ad-9.el8_2.1 | < 0:20200602gitca407c7246bf-4.el8_4.2 | < 0:20190308git89910a39dcfd-6.el8_1.1
- edk2-aarch64< 0:20190829git37eef91017ad-9.el8_2.1 | < 0:20200602gitca407c7246bf-4.el8_4.2 | < 0:20190308git89910a39dcfd-6.el8_1.1
- edk2-ovmf< 0:20190829git37eef91017ad-9.el8_2.1 | < 0:20200602gitca407c7246bf-4.el8_4.2 | < 0:20190308git89910a39dcfd-6.el8_1.1
Debian1 product
- edk2< 2021.08-1
Insyde1 product
- kernel5.0 | 5.1 | 5.2 | 5.3 | 5.4 | 5.5
Ubuntu1 product
- edk2< 0~20160408.ffea0a2c-2ubuntu0.2+esm3 | < 0~20180205.c0d9813c-2ubuntu0.3+esm2 | < 0~20191122.bd85bf54-2ubuntu3.3
5 vendors · 8 products
References
19 links- www.insyde.com/security-pledge/SA-2023025Third Party Advisory
