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Fencer Vulns
high 8.2

CVE-2020-10543 in the critical feed json

Perl before 5.30.3 on 32-bit platforms allows a heap-based buffer overflow because nested regular expression quantifiers have an integer ov…

published 2020-06-05 6 y ago modified 2026-10-14 26 d ago also EUVD-2020-2996

cvss
8.2
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
11.3%
EPSS 11.3% chance of exploitation in 30 days, percentile 96%
public exploits
0
none known

Summary

Perl before 5.30.3 on 32-bit platforms allows a heap-based buffer overflow because nested regular expression quantifiers have an integer overflow.

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
  • perl Debian 14, Debian 13, Debian 12 5.30.3-1

debian advisories DEBIAN-CVE-2020-10543

  • perl Ubuntu 16.04 LTS 5.22.1-9ubuntu0.9
  • perl Ubuntu 18.04 LTS 5.26.1-6ubuntu0.5
  • perl Ubuntu 20.04 LTS 5.30.0-9ubuntu0.2
  • perl Ubuntu Pro 14.04 LTS 5.18.2-2ubuntu1.7+esm3

ubuntu advisories UBUNTU-CVE-2020-10543

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

  • perl hummingbird 1 5.42.2-524.hum1
  • perl-B hummingbird 1 1.89-524.hum1
  • perl-if hummingbird 1 0.61.000-524.hum1
  • perl-IO hummingbird 1 1.55-524.hum1
  • perl-ph hummingbird 1 5.42.2-524.hum1
  • perl-lib hummingbird 1 0.65-524.hum1
  • perl-mro hummingbird 1 1.29-524.hum1
  • perl-Net hummingbird 1 1.04-524.hum1

red hat advisories RHSA-2026:6206RHSA-2021:1266RHSA-2021:1032RHSA-2021:0883RHSA-2021:0343RHSA-2021:2792

  • perl SLE Module for Package Hub 15 SP2, SLE Module for Package Hub 15 SP1, SLE Module for Development Tools 15 SP2 +7 more 5.26.1-7.12.1
  • perl SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +12 more 5.18.2-12.23.1

suse advisories SUSE-SU-2020:1682-2SUSE-SU-2020:1682-1SUSE-SU-2020:1662-1

  • perl openSUSE Tumbleweed 5.34.0-1.1
  • perl openSUSE Leap 15.1 5.26.1-lp151.9.6.1

opensuse advisories openSUSE-SU-2024:11158-1openSUSE-SU-2020:0850-1

  • perl Rocky Linux 8 4:5.26.3-419.el8

rocky linux advisories RLSA-2021:1678

  • perl Alpine 3.10 5.28.3-r0
  • perl Alpine 3.24, Alpine 3.23, Alpine 3.22 +11 more 5.30.3-r0
  • perl Alpine 3.9 5.26.3-r1

alpine advisories ALPINE-CVE-2020-10543

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

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-2020-10543 updated cvss 8.2

perl: heap-based buffer overflow in regular expression compiler leads to DoS

  • Red Hat Enterprise Linux 5 perl Red Hat Enterprise Linux 6 perl, perl-CGI, perl-core, perl-CPAN, perl-libs, perl-parent, +39 more Red Hat Enterprise Linux 8 perl, perl-IO, perl-libs, perl-open, perl-Test, perl-Errno, +19 more
    affected: workaround, no fix planned “To mitigate this flaw, developers should not allow untrusted regular expressions to be compiled by the Perl regular expression compiler.”
  • Red Hat Enterprise Linux AppStream (v. 8) perl 5.26.3-419.el8, perl-open 1.11-419.el8, perl-Test 1.30-419.el8, perl-Memoize 1.03-419.el8, perl-tests 5.26.3-419.el8, perl-utils 5.26.3-419.el8, +12 more
    fixed: vendor fix “To mitigate this flaw, developers should not allow untrusted regular expressions to be compiled by the Perl regular expression compiler.” RHSA-2021:1678
  • Red Hat Enterprise Linux AppStream EUS (v. 8.2) perl 5.26.3-418.el8_2.1, perl-open 1.11-418.el8_2.1, perl-Test 1.30-418.el8_2.1, perl-Memoize 1.03-418.el8_2.1, perl-tests 5.26.3-418.el8_2.1, perl-utils 5.26.3-418.el8_2.1, +12 more
    fixed: vendor fix “To mitigate this flaw, developers should not allow untrusted regular expressions to be compiled by the Perl regular expression compiler.” RHSA-2021:2792
  • Red Hat Enterprise Linux BaseOS (v. 8) perl 5.26.3-419.el8, perl-IO 1.38-419.el8, perl-Errno 1.28-419.el8, perl-libs 5.26.3-419.el8, perl-IO-Zlib 1.10-419.el8, perl-macros 5.26.3-419.el8, +2 more
    fixed: vendor fix “To mitigate this flaw, developers should not allow untrusted regular expressions to be compiled by the Perl regular expression compiler.” RHSA-2021:1678
  • Red Hat Enterprise Linux BaseOS EUS (v. 8.2) perl 5.26.3-418.el8_2.1, perl-IO 1.38-418.el8_2.1, perl-Errno 1.28-418.el8_2.1, perl-libs 5.26.3-418.el8_2.1, perl-IO-Zlib 1.10-418.el8_2.1, perl-macros 5.26.3-418.el8_2.1, +2 more
    fixed: vendor fix “To mitigate this flaw, developers should not allow untrusted regular expressions to be compiled by the Perl regular expression compiler.” RHSA-2021:2792
  • Red Hat Enterprise Linux Client (v. 7) perl 5.16.3-299.el7_9, perl-core 5.16.3-299.el7_9, perl-CPAN 1.9800-299.el7_9, perl-libs 5.16.3-299.el7_9, perl-IO-Zlib 1.10-299.el7_9, perl-macros 5.16.3-299.el7_9, +10 more Red Hat Enterprise Linux Client Optional (v. 7) perl-tests 5.16.3-299.el7_9
    fixed: vendor fix “To mitigate this flaw, developers should not allow untrusted regular expressions to be compiled by the Perl regular expression compiler.” RHSA-2021:0343
  • Red Hat Enterprise Linux ComputeNode EUS (v. 7.6) perl 5.16.3-294.el7_6.1, perl-core 5.16.3-294.el7_6.1, perl-CPAN 1.9800-294.el7_6.1, perl-libs 5.16.3-294.el7_6.1, perl-IO-Zlib 1.10-294.el7_6.1, perl-macros 5.16.3-294.el7_6.1, +10 more
    fixed: vendor fix “To mitigate this flaw, developers should not allow untrusted regular expressions to be compiled by the Perl regular expression compiler.” RHSA-2021:0883
  • Red Hat Enterprise Linux ComputeNode EUS (v. 7.7) perl 5.16.3-294.el7_7.1, perl-core 5.16.3-294.el7_7.1, perl-CPAN 1.9800-294.el7_7.1, perl-libs 5.16.3-294.el7_7.1, perl-IO-Zlib 1.10-294.el7_7.1, perl-macros 5.16.3-294.el7_7.1, +10 more
    fixed: vendor fix “To mitigate this flaw, developers should not allow untrusted regular expressions to be compiled by the Perl regular expression compiler.” RHSA-2021:1032
show 15 more
  • Red Hat Enterprise Linux ComputeNode Optional (v. 7) perl-tests 5.16.3-299.el7_9
    fixed: vendor fix “To mitigate this flaw, developers should not allow untrusted regular expressions to be compiled by the Perl regular expression compiler.” RHSA-2021:0343
  • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6) perl-tests 5.16.3-294.el7_6.1
    fixed: vendor fix “To mitigate this flaw, developers should not allow untrusted regular expressions to be compiled by the Perl regular expression compiler.” RHSA-2021:0883
  • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7) perl-tests 5.16.3-294.el7_7.1
    fixed: vendor fix “To mitigate this flaw, developers should not allow untrusted regular expressions to be compiled by the Perl regular expression compiler.” RHSA-2021:1032
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) perl 5.16.3-294.el7_6.1, perl-core 5.16.3-294.el7_6.1, perl-CPAN 1.9800-294.el7_6.1, perl-libs 5.16.3-294.el7_6.1, perl-IO-Zlib 1.10-294.el7_6.1, perl-macros 5.16.3-294.el7_6.1, +10 more Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) perl-tests 5.16.3-294.el7_6.1
    fixed: vendor fix “To mitigate this flaw, developers should not allow untrusted regular expressions to be compiled by the Perl regular expression compiler.” RHSA-2021:0883
  • Red Hat Enterprise Linux Server (v. 7) perl 5.16.3-299.el7_9, perl-core 5.16.3-299.el7_9, perl-CPAN 1.9800-299.el7_9, perl-libs 5.16.3-299.el7_9, perl-IO-Zlib 1.10-299.el7_9, perl-macros 5.16.3-299.el7_9, +10 more
    fixed: vendor fix “To mitigate this flaw, developers should not allow untrusted regular expressions to be compiled by the Perl regular expression compiler.” RHSA-2021:0343
  • Red Hat Enterprise Linux Server AUS (v. 7.4) perl 5.16.3-292.el7_4.2, perl-core 5.16.3-292.el7_4.2, perl-CPAN 1.9800-292.el7_4.2, perl-libs 5.16.3-292.el7_4.2, perl-IO-Zlib 1.10-292.el7_4.2, perl-macros 5.16.3-292.el7_4.2, +10 more Red Hat Enterprise Linux Server E4S (v. 7.4) perl 5.16.3-292.el7_4.2, perl-core 5.16.3-292.el7_4.2, perl-CPAN 1.9800-292.el7_4.2, perl-libs 5.16.3-292.el7_4.2, perl-IO-Zlib 1.10-292.el7_4.2, perl-macros 5.16.3-292.el7_4.2, +10 more
    fixed: vendor fix “To mitigate this flaw, developers should not allow untrusted regular expressions to be compiled by the Perl regular expression compiler.” RHSA-2021:1266
  • Red Hat Enterprise Linux Server EUS (v. 7.6) perl 5.16.3-294.el7_6.1, perl-core 5.16.3-294.el7_6.1, perl-CPAN 1.9800-294.el7_6.1, perl-libs 5.16.3-294.el7_6.1, perl-IO-Zlib 1.10-294.el7_6.1, perl-macros 5.16.3-294.el7_6.1, +10 more
    fixed: vendor fix “To mitigate this flaw, developers should not allow untrusted regular expressions to be compiled by the Perl regular expression compiler.” RHSA-2021:0883
  • Red Hat Enterprise Linux Server EUS (v. 7.7) perl 5.16.3-294.el7_7.1, perl-core 5.16.3-294.el7_7.1, perl-CPAN 1.9800-294.el7_7.1, perl-libs 5.16.3-294.el7_7.1, perl-IO-Zlib 1.10-294.el7_7.1, perl-macros 5.16.3-294.el7_7.1, +10 more
    fixed: vendor fix “To mitigate this flaw, developers should not allow untrusted regular expressions to be compiled by the Perl regular expression compiler.” RHSA-2021:1032
  • Red Hat Enterprise Linux Server Optional (v. 7) perl-tests 5.16.3-299.el7_9
    fixed: vendor fix “To mitigate this flaw, developers should not allow untrusted regular expressions to be compiled by the Perl regular expression compiler.” RHSA-2021:0343
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.4) perl-tests 5.16.3-292.el7_4.2 Red Hat Enterprise Linux Server Optional E4S (v. 7.4) perl-tests 5.16.3-292.el7_4.2
    fixed: vendor fix “To mitigate this flaw, developers should not allow untrusted regular expressions to be compiled by the Perl regular expression compiler.” RHSA-2021:1266
  • Red Hat Enterprise Linux Server Optional EUS (v. 7.6) perl-tests 5.16.3-294.el7_6.1
    fixed: vendor fix “To mitigate this flaw, developers should not allow untrusted regular expressions to be compiled by the Perl regular expression compiler.” RHSA-2021:0883
  • Red Hat Enterprise Linux Server Optional EUS (v. 7.7) perl-tests 5.16.3-294.el7_7.1
    fixed: vendor fix “To mitigate this flaw, developers should not allow untrusted regular expressions to be compiled by the Perl regular expression compiler.” RHSA-2021:1032
  • Red Hat Enterprise Linux Server Optional TUS (v. 7.4) perl-tests 5.16.3-292.el7_4.2 Red Hat Enterprise Linux Server TUS (v. 7.4) perl 5.16.3-292.el7_4.2, perl-core 5.16.3-292.el7_4.2, perl-CPAN 1.9800-292.el7_4.2, perl-libs 5.16.3-292.el7_4.2, perl-IO-Zlib 1.10-292.el7_4.2, perl-macros 5.16.3-292.el7_4.2, +10 more
    fixed: vendor fix “To mitigate this flaw, developers should not allow untrusted regular expressions to be compiled by the Perl regular expression compiler.” RHSA-2021:1266
  • Red Hat Enterprise Linux Workstation (v. 7) perl 5.16.3-299.el7_9, perl-core 5.16.3-299.el7_9, perl-CPAN 1.9800-299.el7_9, perl-libs 5.16.3-299.el7_9, perl-IO-Zlib 1.10-299.el7_9, perl-macros 5.16.3-299.el7_9, +10 more Red Hat Enterprise Linux Workstation Optional (v. 7) perl-tests 5.16.3-299.el7_9
    fixed: vendor fix “To mitigate this flaw, developers should not allow untrusted regular expressions to be compiled by the Perl regular expression compiler.” RHSA-2021:0343
  • Red Hat Hardened Images perl 5.42.2-524.hum1, perl-B 1.89-524.hum1, perl-IO 1.55-524.hum1, perl-Tie 4.6-524.hum1, perl-lib 0.65-524.hum1, perl-mro 1.29-524.hum1, +93 more
    fixed: vendor fix “To mitigate this flaw, developers should not allow untrusted regular expressions to be compiled by the Perl regular expression compiler.” RHSA-2026:6206

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 8.2

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

11.33% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:N/I:P/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

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.