What’s Vulnerable › Vulnerabilities

CVE-2019-6453

• Severity: high (CVSS 8.1 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 54.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-02-18 · updated 2026-06-17
• Weakness: CWE-88

Description

mIRC before 7.55 allows remote command execution by using argument injection through custom URI protocol handlers. The attacker can specify an irc:// URI that loads an arbitrary .ini file from a UNC share pathname. Exploitation depends on browser-specific URI handling (Chrome is not exploitable).

Affected products

• mIRC: before 7.55 — fixed in 7.55

How to fix

Upgrade to a fixed version: mIRC 7.55. Check the vendor advisory for mitigations.

References

• https://github.com/proofofcalc/cve-2019-6453-poc
• https://proofofcalc.com/advisories/20190218.txt
• https://proofofcalc.com/cve-2019-6453-mIRC/
• https://twitter.com/proofofcalc/status/1097518413143003136
• https://www.exploit-db.com/exploits/46392/
• https://www.mirc.com/news.html
• https://github.com/proofofcalc/cve-2019-6453-poc
• https://proofofcalc.com/advisories/20190218.txt
• https://proofofcalc.com/cve-2019-6453-mIRC/
• https://twitter.com/proofofcalc/status/1097518413143003136
• https://www.exploit-db.com/exploits/46392/
• https://www.mirc.com/news.html

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