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Fencer Vulns
medium 5.1

CVE-2020-1751 json

An out-of-bounds write vulnerability was found in glibc before 2.31 when handling signal trampolines on PowerPC.

published 2020-04-17 6 y ago modified 2026-10-14 26 d ago also EUVD-2020-12582

cvss
5.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits
0
none known

Summary

An out-of-bounds write vulnerability was found in glibc before 2.31 when handling signal trampolines on PowerPC. Specifically, the backtrace function did not properly check the array bounds when storing the frame address, resulting in a denial of service or potential code execution. The highest threat from this vulnerability is to system availability.

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
  • glibc Debian 14, Debian 13, Debian 12 2.30-3

debian advisories DEBIAN-CVE-2020-1751

  • glibc Ubuntu 16.04 LTS 2.23-0ubuntu11.2
  • glibc Ubuntu 18.04 LTS 2.27-3ubuntu1.2

ubuntu advisories UBUNTU-CVE-2020-1751

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

  • glibc RHEL 8 2.28-127.el8
  • nscd RHEL 8 2.28-127.el8
  • libnsl RHEL 8 2.28-127.el8
  • nss_db RHEL 8 2.28-127.el8
  • nss_hesiod RHEL 8 2.28-127.el8
  • glibc-utils RHEL 8 2.28-127.el8
  • glibc-common RHEL 8 2.28-127.el8
  • glibc-benchtests RHEL 8 2.28-127.el8

red hat advisories RHSA-2020:4444

  • glibc SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +3 more 2.22-100.21.5

suse advisories SUSE-SU-2020:0832-1

  • glibc openSUSE Tumbleweed 2.38-6.1

opensuse advisories openSUSE-SU-2024:13388-1

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-2020-1751 updated cvss 7.0

glibc: array overflow in backtrace functions for powerpc

  • Red Hat CodeReady Linux Builder (v. 8) nss_hesiod 2.28-127.el8, glibc-benchtests 2.28-127.el8, glibc-debuginfo-common 2.28-127.el8 Red Hat Enterprise Linux AppStream (v. 8) glibc-utils 2.28-127.el8, glibc-debuginfo-common 2.28-127.el8, compat-libpthread-nonshared 2.28-127.el8 Red Hat Enterprise Linux BaseOS (v. 8) nscd 2.28-127.el8, glibc 2.28-127.el8, libnsl 2.28-127.el8, nss_db 2.28-127.el8, glibc-common 2.28-127.el8, glibc-all-langpacks 2.28-127.el8, +3 more
    fixed: vendor fix RHSA-2020:4444
  • Red Hat Enterprise Linux 5 glibc Red Hat Enterprise Linux 6 nscd, glibc, glibc-utils, glibc-common Red Hat Enterprise Linux 7 nscd, glibc, glibc-utils, glibc-common
    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 5.1

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

0.54% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.1 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 5.9 AV:L/AC:M/Au:N/C:P/I:P/A:C

Affected products

  • Red Hat glibc
  • 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

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.