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Fencer Vulns
high 8.1

CVE-2021-38575 json

NetworkPkg/IScsiDxe has remotely exploitable buffer overflows.

published 2021-12-01 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-25017

cvss
8.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.0%
EPSS 2.0% chance of exploitation in 30 days, percentile 80%
public exploits
0
none known

Summary

NetworkPkg/IScsiDxe has remotely exploitable buffer overflows.

Patch / fix

  • edk2 Debian 14, Debian 13, Debian 12 2021.08-1

debian advisories DEBIAN-CVE-2021-38575

  • edk2 Ubuntu 20.04 LTS 0~20191122.bd85bf54-2ubuntu3.3
  • edk2 Ubuntu Pro 16.04 LTS 0~20160408.ffea0a2c-2ubuntu0.2+esm3
  • edk2 Ubuntu Pro 18.04 LTS 0~20180205.c0d9813c-2ubuntu0.3+esm2

ubuntu advisories UBUNTU-CVE-2021-38575

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • redhat-virtualization-host rhev hypervisor 4.4 4.4.7-20210804.0.el8_4
  • redhat-virtualization-host-image-update rhev hypervisor 4.4 4.4.7-20210804.0.el8_4
  • edk2 RHEL 8 20200602gitca407c7246bf-4.el8_4.2
  • edk2-ovmf RHEL 8 20200602gitca407c7246bf-4.el8_4.2
  • edk2-aarch64 RHEL 8 20200602gitca407c7246bf-4.el8_4.2
  • edk2 RHEL 8.2 EUS 20190829git37eef91017ad-9.el8_2.1
  • edk2-ovmf RHEL 8.2 EUS 20190829git37eef91017ad-9.el8_2.1
  • edk2-aarch64 RHEL 8.2 EUS 20190829git37eef91017ad-9.el8_2.1

red hat advisories RHSA-2021:3369RHSA-2021:3235RHSA-2021:3172RHSA-2021:3066

  • edk2 Rocky Linux 8 20200602gitca407c7246bf-4.el8_4.2

rocky linux advisories RLSA-2021:3066

  • edk2-shell Arch Linux 202108-1

arch linux advisories AVG-2382

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-38575 updated cvss 8.1

edk2: remote buffer overflow in IScsiHexToBin function in NetworkPkg/IScsiDxe

  • Red Hat Enterprise Linux 7 ovmf, OVMF, AAVMF
    affected: no fix available
  • Red Hat Enterprise Linux AppStream (v. 8) edk2 20200602gitca407c7246bf-4.el8_4.2, edk2-ovmf 20200602gitca407c7246bf-4.el8_4.2, edk2-aarch64 20200602gitca407c7246bf-4.el8_4.2
    fixed: vendor fix RHSA-2021:3066
  • Red Hat Enterprise Linux AppStream EUS (v. 8.1) edk2 20190308git89910a39dcfd-6.el8_1.1, edk2-ovmf 20190308git89910a39dcfd-6.el8_1.1, edk2-aarch64 20190308git89910a39dcfd-6.el8_1.1
    fixed: vendor fix RHSA-2021:3172
  • Red Hat Enterprise Linux AppStream EUS (v. 8.2) edk2 20190829git37eef91017ad-9.el8_2.1, edk2-ovmf 20190829git37eef91017ad-9.el8_2.1, edk2-aarch64 20190829git37eef91017ad-9.el8_2.1
    fixed: vendor fix RHSA-2021:3369
  • Red Hat Virtualization 4 Hypervisor for RHEL 8 redhat-virtualization-host 4.4.7-20210804.0.el8_4, redhat-virtualization-host-image-update 4.4.7-20210804.0.el8_4
    fixed: vendor fix RHSA-2021:3235
  • Red Hat Enterprise Linux 9 edk2, edk2-ovmf, edk2-tools, edk2-aarch64 Red Hat RHEL 8-based RHEV-H for RHEV 4 (build requirements) imgbased 1.2.23-1.el8ev, python3-imgbased 1.2.23-1.el8ev, redhat-release-virtualization-host 4.4.7-4.el8ev, redhat-virtualization-host-image-update-placeholder 4.4.7-4.el8ev
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.99% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.tianocore.org https://bugzilla.tianocore.org/show_bug.cgi?id=3356 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • TianoCore EDK II

Classification

Weakness
  • CWE-124 Buffer Underwrite
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

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.