Inefficient regular expression complexity in CGI - CVE-2025-27220

Vulnerability identifier: #VU105107

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-27220

CWE-ID: CWE-1333

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient input validation when processing untrusted input with a regular expressions in CGI::Util#escapeElement. A remote attacker can pass specially crafted data to the application and perform regular expression denial of service (ReDos) attack.

CGI
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP3
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Manager Proxy
SUSE Enterprise Storage
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
Basesystem Module
openSUSE Leap
Ubuntu
openEuler
Netcool Operations Insight
libruby2.5 (Ubuntu package)
ruby2.5 (Ubuntu package)
ruby2.3 (Ubuntu package)
libruby2.3 (Ubuntu package)
rubygem-net-telnet
rubygem-rss
rubygem-xmlrpc
rubygem-io-console
rubygem-typeprof
rubygem-power_assert
rubygem-did_you_mean
rubygem-bigdecimal
rubygem-rbs
rubygem-json
rubygem-openssl
rubygem-bundler
ruby-debuginfo
ruby-debugsource
ruby-devel
ruby
ruby-help
ruby-irb
libruby2_5-2_5
ruby2.5-doc-ri
ruby2.5-devel-extra
ruby2.5-debugsource
libruby2_5-2_5-debuginfo
ruby2.5-debuginfo
ruby2.5-stdlib-debuginfo
ruby2.5-stdlib
ruby2.5-doc
ruby2.5-devel
ruby2.5
rubygems-devel
rubygems
rubygem-psych
ruby-bundled-gems
rubygem-rexml
rubygem-test-unit
rubygem-minitest
rubygem-rdoc
rubygem-rake
APEX Cloud Platform for Microsoft Azure

Install updates from vendor's website.

CGI - addressed in versions 0.3.5.1, 0.3.7, 0.4.2
Netcool Operations Insight - update to 1.6.15
libruby2.5 (Ubuntu package) - update to Ubuntu Pro
ruby2.5 (Ubuntu package) - update to Ubuntu Pro
ruby2.3 (Ubuntu package) - update to Ubuntu Pro (Infra-only)
libruby2.3 (Ubuntu package) - update to Ubuntu Pro (Infra-only)
rubygem-net-telnet - update to 0.1.1-133
rubygem-rss - addressed in versions 0.2.9-142, 0.2.9-149
rubygem-xmlrpc - update to 0.3.0-133
rubygem-io-console - addressed in versions 0.4.6-133, 0.5.7-142, 0.6.0-149
rubygem-typeprof - addressed in versions 0.15.2-142, 0.21.3-149
rubygem-power_assert - update to 1.1.1-133
rubygem-did_you_mean - addressed in versions 1.2.0-133, 1.5.0-142, 1.6.3-149
rubygem-bigdecimal - addressed in versions 1.3.4-133, 3.0.0-142, 3.1.3-149
rubygem-rbs - addressed in versions 1.4.0-142, 2.8.2-149
APEX Cloud Platform for Microsoft Azure - update to 01.05.01.00
rubygem-json - addressed in versions 2.1.0-133, 2.5.1-142, 2.6.3-149
rubygem-openssl - addressed in versions 2.1.2-133, 2.2.1-142, 3.1.0-149
rubygem-bundler - update to 2.2.32-142
ruby-debuginfo - addressed in versions 2.5.8-133, 3.0.3-142, 3.2.2-149
ruby-debugsource - addressed in versions 2.5.8-133, 3.0.3-142, 3.2.2-149
ruby-devel - addressed in versions 2.5.8-133, 3.0.3-142, 3.2.2-149
ruby - addressed in versions 2.5.8-133, 3.0.3-142, 3.2.2-149
ruby-help - addressed in versions 2.5.8-133, 3.0.3-142, 3.2.2-149
ruby-irb - addressed in versions 2.5.8-133, 3.0.3-142, 3.2.2-149
libruby2_5-2_5 - addressed in versions 2.5.9-150000.4.41.1, 2.5.9-150700.24.3.1
ruby2.5-doc-ri - update to 2.5.9-150000.4.41.1
ruby2.5-devel-extra - addressed in versions 2.5.9-150000.4.41.1, 2.5.9-150700.24.3.1
ruby2.5-debugsource - addressed in versions 2.5.9-150000.4.41.1, 2.5.9-150700.24.3.1
libruby2_5-2_5-debuginfo - addressed in versions 2.5.9-150000.4.41.1, 2.5.9-150700.24.3.1
ruby2.5-debuginfo - addressed in versions 2.5.9-150000.4.41.1, 2.5.9-150700.24.3.1
ruby2.5-stdlib-debuginfo - addressed in versions 2.5.9-150000.4.41.1, 2.5.9-150700.24.3.1
ruby2.5-stdlib - addressed in versions 2.5.9-150000.4.41.1, 2.5.9-150700.24.3.1
ruby2.5-doc - update to 2.5.9-150000.4.41.1
ruby2.5-devel - addressed in versions 2.5.9-150000.4.41.1, 2.5.9-150700.24.3.1
ruby2.5 - addressed in versions 2.5.9-150000.4.41.1, 2.5.9-150700.24.3.1
rubygems-devel - addressed in versions 2.7.6-133, 3.2.32-142, 3.4.10-149
rubygems - addressed in versions 2.7.6-133, 3.2.32-142, 3.4.10-149
rubygem-psych - addressed in versions 3.0.2-133, 3.3.2-142, 5.0.1-149
ruby-bundled-gems - update to 3.2.2-149
rubygem-rexml - addressed in versions 3.2.5-142, 3.2.5-149
rubygem-test-unit - addressed in versions 3.2.7-133, 3.3.7-142, 3.5.7-149
rubygem-minitest - addressed in versions 5.10.3-133, 5.14.2-142, 5.16.3-149
rubygem-rdoc - addressed in versions 6.0.1.1-133, 6.3.3-142, 6.5.0-149
rubygem-rake - addressed in versions 12.3.0-133, 13.0.3-142, 13.0.6-149

• https://www.ruby-lang.org/en/news/2025/02/26/security-advisories/

• Multiple vulnerabilities in CGI gem
• openEuler 20.03 LTS SP4 update for ruby
• openEuler 22.03 LTS SP4 update for ruby
• openEuler 24.03 LTS update for ruby
• openEuler 24.03 LTS SP1 update for ruby
• openEuler 22.03 LTS SP3 update for ruby
• Ubuntu update for ruby2.3
• SUSE update for ruby2.5
• Red Hat Enterprise Linux 9 update for the ruby:3.1 module
• Dell APEX Cloud Platform for Microsoft Azure update for third-party components
• Multiple vulnerabilities in Netcool Operations Insight
• SUSE update for ruby2.5