How severe is CVE-2019-9535?

CVE-2019-9535 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-9535 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-9535?

CVE-2019-9535 affects Iterm2. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-9535?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2019-9535 published?

CVE-2019-9535 was published on 2019-10-09 and last updated on 2026-06-17.

CVE-2019-9535

CVE-2019-9535 is a critical-severity vulnerability in Iterm2 with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-74.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 2% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: Iterm2
Published: 2019-10-09
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2019-9535?: 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.
How severe is CVE-2019-9535?: CVE-2019-9535 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-9535 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-9535?: CVE-2019-9535 affects Iterm2. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-9535?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2019-9535 published?: CVE-2019-9535 was published on 2019-10-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:iterm2:iterm2:*:*:*:*:*:*:*:*

More vulnerabilities in Iterm2

CVE-2024-38396 — Critical (CVSS 9.8): An issue was discovered in iTerm2 3.5.x before 3.5.2. Unfiltered use of an escape sequence to report a window title, in…
CVE-2024-38395 — Critical (CVSS 9.8): In iTerm2 before 3.5.2, the "Terminal may report window title" setting is not honored, and thus remote code execution…
CVE-2023-46322 — Critical (CVSS 9.8): iTermSessionLauncher.m in iTerm2 before 3.5.0beta12 does not sanitize ssh hostnames in URLs. The hostname's initial…
CVE-2023-46321 — Critical (CVSS 9.8): iTermSessionLauncher.m in iTerm2 before 3.5.0beta12 does not sanitize paths in x-man-page URLs. They may have shell…
CVE-2023-46301 — Critical (CVSS 9.8): iTerm2 before 3.4.20 allow (potentially remote) code execution because of mishandling of certain escape sequences…
CVE-2023-46300 — Critical (CVSS 9.8): iTerm2 before 3.4.20 allow (potentially remote) code execution because of mishandling of certain escape sequences…

All CVEs affecting Iterm2 →

Other CWE-74 (Improper Neutralization of Special Elements (Injection)) vulnerabilities

CVE-2026-25586 — Critical (CVSS 10.0): SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, a sandbox escape is possible by shadowing hasOwnProperty…
CVE-2026-25520 — Critical (CVSS 10.0): SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, The return values of functions aren't wrapped.…
CVE-2025-20265 — Critical (CVSS 10.0): A vulnerability in the RADIUS subsystem implementation of Cisco Secure Firewall Management Center (FMC) Software could…
CVE-2025-20337 — Critical (CVSS 10.0): A vulnerability in a specific API of Cisco ISE and Cisco ISE-PIC could allow an unauthenticated, remote attacker to…
CVE-2025-20281 — Critical (CVSS 10.0): A vulnerability in a specific API of Cisco ISE and Cisco ISE-PIC could allow an unauthenticated, remote attacker to…
CVE-2024-42472 — Critical (CVSS 10.0): Flatpak is a Linux application sandboxing and distribution framework. Prior to versions 1.14.0 and 1.15.10, a malicious…

Browse all CWE-74 (Improper Neutralization of Special Elements (Injection)) vulnerabilities →