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Fencer Vulns
medium 5.5

CVE-2018-20673 json

The demangle_template function in cplus-dem.c in GNU libiberty, as distributed in GNU Binutils 2.31.1, contains an integer overflow vulnera…

published 2019-01-04 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-13224

cvss
5.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 76%
public exploits
0
none known

Summary

The demangle_template function in cplus-dem.c in GNU libiberty, as distributed in GNU Binutils 2.31.1, contains an integer overflow vulnerability (for "Create an array for saving the template argument values") that can trigger a heap-based buffer overflow, as demonstrated by nm.

Patch / fix

  • gcc RHEL 8 8.5.0-3.el8
  • cpp RHEL 8 8.5.0-3.el8
  • libgcc RHEL 8 8.5.0-3.el8
  • libitm RHEL 8 8.5.0-3.el8
  • gcc-c++ RHEL 8 8.5.0-3.el8
  • libasan RHEL 8 8.5.0-3.el8
  • libgomp RHEL 8 8.5.0-3.el8
  • liblsan RHEL 8 8.5.0-3.el8

red hat advisories RHSA-2021:4386

  • gcc AlmaLinux 8 8.5.0-3.el8.alma
  • cpp AlmaLinux 8 8.5.0-3.el8.alma
  • gcc-c++ AlmaLinux 8 8.5.0-3.el8.alma
  • gcc-gfortran AlmaLinux 8 8.5.0-3.el8.alma
  • gcc-gdb-plugin AlmaLinux 8 8.5.0-3.el8.alma
  • gcc-offload-nvptx AlmaLinux 8 8.5.0-3.el8.alma

almalinux advisories ALSA-2021:4386

  • gcc Rocky Linux 8 8.5.0-3.el8

rocky linux advisories RLSA-2021:4386

  • crash Azure Linux 3.0 9.0.0-1

azure linux advisories AZL-41601

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2018-20673 updated cvss 5.3

libiberty: Integer overflow in demangle_template() function

  • Red Hat Enterprise Linux 5 gcc, gdb, binutils Red Hat Enterprise Linux 6 cpp, gcc, gdb, libgcc, libgcj, libitm, +17 more Red Hat Enterprise Linux 7 cpp, gcc, libgo, gcc-go, libgcc, libitm, +16 more Red Hat Enterprise Linux 8 binutils, mingw-binutils, mingw32-binutils, mingw64-binutils, mingw-binutils-generic
    affected: no fix planned “Will not fix”
  • Red Hat CodeReady Linux Builder (v. 8) cpp-debuginfo 8.5.0-3.el8, gcc-debuginfo 8.5.0-3.el8, gcc-debugsource 8.5.0-3.el8, gcc-plugin-devel 8.5.0-3.el8, libgcc-debuginfo 8.5.0-3.el8, libitm-debuginfo 8.5.0-3.el8, +16 more Red Hat Enterprise Linux AppStream (v. 8) cpp 8.5.0-3.el8, gcc 8.5.0-3.el8, gcc-c++ 8.5.0-3.el8, gcc-gfortran 8.5.0-3.el8, gcc-gdb-plugin 8.5.0-3.el8, gcc-offload-nvptx 8.5.0-3.el8 Red Hat Enterprise Linux BaseOS (v. 8) gcc 8.5.0-3.el8, libgcc 8.5.0-3.el8, libitm 8.5.0-3.el8, libasan 8.5.0-3.el8, libgomp 8.5.0-3.el8, liblsan 8.5.0-3.el8, +7 more
    fixed: vendor fix RHSA-2021:4386
  • Red Hat Enterprise Linux 7 gdb, gdb-gdbserver Red Hat Enterprise Linux 8 gdb, gdb-headless, gdb-gdbserver
    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

1.64% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • sourceware.org https://sourceware.org/bugzilla/show_bug.cgi?id=24039 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 5.5 CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

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.