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CVE-2019-6453· NVD / CVE Program· CNA mitre

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

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).

HighCVSS 8.1 · v3.0—Proof of concept No fix recorded

Noroxi analysis

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Published
Feb 18, 2019
Updated
Jun 16, 2026
EPSS
54.3% · 99th percentile
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Report tools

JSON

Action score

48

Plan

Add it to your regular patch cycle.

CVSS
32 / 40 · 8.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
16 / 30 · 54.3%

Affected systems

VendorProduct
mircmirc

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • mirc mircbefore 7.55

Same product

mirc: all records

Other highest-scoring records for the same primary product.

  • CVE-2008-4449Stack-based buffer overflow in mIRC 6.34 allows remote attackers to execute arbitrary code via a long hostname in a PRIVMSG message.
    49Plan
  • CVE-2003-1336Buffer overflow in mIRC before 6.11 allows remote attackers to execute arbitrary code via a long irc:// URL.
    48Plan
  • CVE-2008-7314mIRC before 6.35 allows attackers to cause a denial of service (crash) via a long nickname.
    30Monitor
  • CVE-2007-4402Multiple unspecified scripts in mIRC allow user-assisted remote attackers to execute arbitrary code via the '|' (pipe) shell metacharacter i
    28Monitor
  • CVE-2011-5282mIRC prior to 7.22 has a message leak because chopping of outbound messages is mishandled.
    21Monitor
  • CVE-2003-1508Buffer overflow in mIRC 6.12, when the DCC get dialog window has been minimized and the user opens the minimized window, allows remote attac
    18Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Exploit-DB entry ×1
  • Proof-of-concept repository on GitHub ×2

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Exploit-DB entryremote2019-02-18
Proof-of-concept repository on GitHubstars:482019-02-18
Proof-of-concept repository on GitHubstars:12019-07-18

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoCsame day
  2. Published
  3. TodaySep 30, 2026+2781 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-88 · Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

CVSS vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records