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Fencer Vulns
medium 5.5

CVE-2021-37600 json

An integer overflow in util-linux through 2.37.1 can potentially cause a buffer overflow if an...

published 2021-07-28 5 y ago modified 2026-10-14 26 d ago also EUVD-2021-24158 , JLSEC-2025-190

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 51%
public exploits
0
none known

Summary

An integer overflow in util-linux through 2.37.1 can potentially cause a buffer overflow if an attacker were able to use system resources in a way that leads to a large number in the /proc/sysvipc/sem file. NOTE: this is unexploitable in GNU C Library environments, and possibly in all realistic environments.

Patch / fix

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP V3.1.5
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • util-linux Debian 14, Debian 13, Debian 12 2.36.1-8

debian advisories DEBIAN-CVE-2021-37600

  • util-linux Ubuntu 22.04 LTS 2.37.2-4ubuntu2

ubuntu advisories UBUNTU-CVE-2021-37600

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

  • util-linux SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 2.31.1-150000.9.18.2
  • util-linux-systemd SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 2.31.1-150000.9.18.2
  • util-linux SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 2.29.2-9.17.1
  • python-libmount SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 2.29.2-9.17.1
  • util-linux-systemd SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 2.29.2-9.17.1
  • util-linux SLES 12 SP2-BCL 2.28-44.35.1
  • python-libmount SLES 12 SP2-BCL 2.28-44.35.1
  • util-linux-systemd SLES 12 SP2-BCL 2.28-44.35.1

suse advisories SUSE-SU-2022:1108-1SUSE-SU-2022:1105-1SUSE-SU-2022:1103-1SUSE-SU-2021:3523-1SUSE-SU-2021:3475-1SUSE-SU-2021:3474-1

  • util-linux openSUSE Leap 15.2 2.33.2-lp152.5.9.1
  • python3-libmount openSUSE Leap 15.2 2.33.2-lp152.5.9.1
  • util-linux-systemd openSUSE Leap 15.2 2.33.2-lp152.5.9.1
  • util-linux openSUSE Leap 15.3 2.36.2-4.5.1
  • python3-libmount openSUSE Leap 15.3 2.36.2-4.5.1
  • util-linux-systemd openSUSE Leap 15.3 2.36.2-4.5.1

opensuse advisories openSUSE-SU-2021:1440-1openSUSE-SU-2021:3474-1

  • util-linux Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 2.37.2-r0

alpine advisories ALPINE-CVE-2021-37600

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • util-linux Arch Linux 2.37.2-1

arch linux advisories AVG-2236

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-2021-37600 updated cvss 4.7

util-linux: integer overflow can lead to buffer overflow in get_sem_elements() in sys-utils/ipcutils.c

  • Red Hat Enterprise Linux 7 uuidd, libuuid, libblkid, libmount, util-linux
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 uuidd, libuuid, libblkid, libfdisk, libmount, util-linux, +3 more Red Hat Enterprise Linux 9 uuidd, libuuid, libblkid, libfdisk, libmount, util-linux, +4 more
    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

cisa ICSA-23-348-10 updated cvss 5.5

Siemens SIMATIC S7-1500

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.0, < 3.1.5
    affected: fixed in V3.1.5, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

0.66% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/karelzak/util-linux/issues/1395 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 1.2 AV:L/AC:H/Au:N/C:N/I:N/A:P

Affected products

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

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.