What’s Vulnerable › Vulnerabilities

CVE-2019-9535: iTerm2, up to and including version 3.3.5, with tmux integration is vulnerable to remote command execution

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-10-09 · updated 2026-06-17
• Weakness: CWE-349

Description

A vulnerability exists in the way that iTerm2 integrates with tmux's control mode, which may allow an attacker to execute arbitrary commands by providing malicious output to the terminal. This affects versions of iTerm2 up to and including 3.3.5. This vulnerability may allow an attacker to execute arbitrary commands on their victim's computer by providing malicious output to the terminal. It could be exploited using command-line utilities that print attacker-controlled content.

Affected products

• iTerm2: through 3.3.5

References

• https://blog.mozilla.org/security/2019/10/09/iterm2-critical-issue-moss-audit/
• https://groups.google.com/forum/#%21topic/iterm2-discuss/57k_AuLdQa4
• https://kb.cert.org/vuls/id/763073/
• https://blog.mozilla.org/security/2019/10/09/iterm2-critical-issue-moss-audit/
• https://groups.google.com/forum/#%21topic/iterm2-discuss/57k_AuLdQa4
• https://kb.cert.org/vuls/id/763073/

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