Cyber Resilience

CVE-2019-6453

Mirc ≤ 7.55

Public PoCHigh EPSS
Published
18 February 2019
Modified
21 November 2024
Patch / advisory
View advisory
CVSS Score v3 8.1
Click a component to see what it means
Raw vectorCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.54 99th percentile
Risk Priority 81 floored blend · peak EPSS

Summary

CVE-2019-6453 is a high-severity Argument Injection (CWE-88) vulnerability in Mirc Mirc. Its CVSS base score is 8.1 (High).

Operationally, ranked in the top 1% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability Data

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…

more

(Chrome is not exploitable).

CWE(s)
CWE-88

Related Threats

Likely ATT&CK TechniquesAI

Techniques this vulnerability likely enables, inferred from its description, weakness type, and attributed-actor tradecraft. Confidence is per-technique.

T1204.001 Malicious Link Executionconfidence: HIGH
Malicious irc:// URI link can be sent to the victim to trigger the vulnerability.
attack.mitre.org →
T1059.003 Windows Command Shell Executionconfidence: HIGH
Argument injection via the irc:// URI handler allows execution of arbitrary commands through mIRC.
attack.mitre.org →
T1021.002 SMB/Windows Admin Shares Lateral Movementconfidence: MEDIUM
Loading an arbitrary .ini file from a UNC share enables remote file access over SMB.
attack.mitre.org →
inferred from description + CWE · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2025-15315Shared CWE-88
CVE-2023-39288Shared CWE-88
CVE-2023-50232Shared CWE-88
CVE-2026-26514Shared CWE-88
CVE-2026-22582Shared CWE-88
CVE-2026-25689Shared CWE-88
CVE-2026-24739Shared CWE-88
CVE-2026-45181Shared CWE-88
CVE-2025-14946Shared CWE-88
CVE-2026-26194Shared CWE-88

Affected Assets

mirc
mirc
≤ 7.55

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V1.2.5

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly require proper input validation and command construction to prevent argument injection.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
detects

Security testing can detect argument injection but does not prevent it at the source.

A.8.25 Secure development life cycle partial match
prevents

Secure development lifecycle mandates input validation and command construction practices that directly prevent argument injection.

A.8.26 Application security requirements partial match
prevents

Application security requirements include explicit rules for safe command-line argument handling and escaping.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles discourage unsafe command invocation patterns and favor safer APIs.

A.8.28 Secure coding partial match
prevents

Secure coding standards explicitly require proper neutralization of command arguments, directly eliminating CWE-88.

A.8.32 Change management none match
none

Change management can catch unsafe command patterns during reviews but is not a direct mitigation.

References