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Fencer Intel
high 8.1

CVE-2019-6453 in the critical feed json

mIRC before 7.55 allows remote command execution by using argument injection through custom URI protocol handlers.

published 7y ago modified 4mo ago also EUVD-2019-16013

cvss
8.1
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
54.6%
EPSS 54.6% chance of exploitation in 30 days, percentile 99%
public exploits
1
Exploit-DB

Summary

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).

Patch / fix

  • mirc mirc 7.55

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Timeline

  1. First public exploit (EDB-46392)
  2. Published

Exploit prediction

54.57% chance of exploitation in the next 30 days, higher than 99% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-46392 mIRC < 7.55 - 'Custom URI Protocol Handlers' Remote Command Execution remote, 2019-02-18
  • github.com https://github.com/proofofcalc/cve-2019-6453-poc referenced PoC, tagged "exploit" by a source, unverified
  • proofofcalc.com https://proofofcalc.com/cve-2019-6453-mIRC/ referenced PoC, tagged "exploit" by a source, unverified
  • twitter.com https://twitter.com/proofofcalc/status/1097518413143003136 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 8.1 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-88 Improper Neutralization of Argument Delimiters in a Command

References

Sources

Fencer Intel 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.