What is CVE-2003-1336?

CVE-2003-1336 is a vulnerability in Mirc, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. Published 2003-12-31.

Is CVE-2003-1336 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Mirc

CVE-2003-1336

Buffer overflow in mIRC before 6.11 allows remote attackers to execute arbitrary code via a long irc:// URL.

Vulnerability class: Buffer Overflow

Published 2003-12-31 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 9.3 (High). Vector: AV:N/AC:M/Au:N/C:C/I:C/A:C. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.357 (98.4th percentile), scored 2026-09-28.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.357 · newest: 0.357 · change: 0.000

Affected products

Mirc

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

Public proof-of-concept exploits

rapid7/metasploit-framework

References

archives.neohapsis.com/archives/ntbugtraq/2003-q4/0060.html (mailing-list, Patch)
www.osvdb.org/2665 (vdb-entry)
www.securiteam.com/windowsntfocus/6M00B0U8KE.html (Patch)
secunia.com/advisories/9996 (Patch, Vendor Advisory, third-party-advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/13405 (vdb-entry)
www.securityfocus.com/bid/8819 (Exploit, Patch, vdb-entry)

Frequently asked questions

What is CVE-2003-1336?: CVE-2003-1336 is a vulnerability in Mirc, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. Published 2003-12-31.
Is CVE-2003-1336 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.