CVE-2003-0113Internet Explorer Vulnerability
Buffer overflow in URLMON.DLL in Microsoft Internet Explorer 5.01, 5.5 and 6.0 allows remote attackers to execute arbitrary code via an HTTP response containing long values in (1) Content-type and (2) Content-encoding fields.
Published May 12, 2003 · Updated Apr 15, 2026
Key Facts
Patch immediately- CVE-2003-0113 is a high-severity vulnerability (CVSS 7.5 v2) affecting Ie (Microsoft), Internet Explorer (Microsoft).
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 39% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Scores
CVSS v2
7.5
AV:N/AC:L/Au:N/C:P/I:P/A:P
EPSS (30-day exploit likelihood)
39%
Higher than 98.5% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
35/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
1
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Description
Buffer overflow in URLMON.DLL in Microsoft Internet Explorer 5.01, 5.5 and 6.0 allows remote attackers to execute arbitrary code via an HTTP response containing long values in (1) Content-type and (2) Content-encoding fields.
Affected Products
9 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| IeMicrosoft | 6.0-sp1 | n/a |
| Internet ExplorerMicrosoft | 5.0.1, 5.0.1-sp1, 5.0.1-sp2, 5.0.1-sp3, 5.5, 5.5-sp1, 5.5-sp2, 6.0 | n/a |
Timeline
Publicly disclosed
May 12, 2003
Last updated
Apr 15, 2026
References
- exploitExploitDB-22530
- other20030426 Buffer overflow in Internet Explorer's HTTP parsing code
- other20030701 URLMON.DLL buffer overflow - technical details
- otherMS03-015
- otheroval:org.mitre.oval:def:926
FAQ
Common Questions.
Buffer overflow in URLMON.DLL in Microsoft Internet Explorer 5.01, 5.5 and 6.0 allows remote attackers to execute arbitrary code via an HTTP response containing long values in (1) Content-type and (2) Content-encoding fields.
Affected: Ie (Microsoft) versions 6.0-sp1; Internet Explorer (Microsoft) versions 5.0.1, 5.0.1-sp1, 5.0.1-sp2, 5.0.1-sp3, 5.5, 5.5-sp1, 5.5-sp2, 6.0. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Is CVE-2003-0113 On Your Attack Surface?
Brandefense matches it against the products discovered on your perimeter and opens a finding the day a CVE like this is listed.
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