CVE-2003-0107Zlib Vulnerability
Buffer overflow in the gzprintf function in zlib 1.1.4, when zlib is compiled without vsnprintf or when long inputs are truncated using vsnprintf, allows attackers to cause a denial of service or possibly execute arbitrary code.
Published Mar 7, 2003 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2003-0107
Key Facts
Patch immediately- CVE-2003-0107 is a high-severity vulnerability (CVSS 7.5 v2) affecting Zlib, rootio-zlib.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 26% probability of exploitation in the next 30 days.
- Fixed versions are available, including rootio-zlib 1:1.1.4-10, Zlib 1:1.1.4-10.
- 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)
26%
Higher than 97.9% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
45/100
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
2
Proof-of-concept links
In-the-wild evidence
1
Reports of active use
Advisories And Exploit References
- advisoryhttps://security-tracker.debian.org/tracker/CVE-2003-0107
- advisoryRHSA-2003:079
- advisoryRHSA-2003:081
- advisoryzlib-gzprintf-bo(11381)
Description
Buffer overflow in the gzprintf function in zlib 1.1.4, when zlib is compiled without vsnprintf or when long inputs are truncated using vsnprintf, allows attackers to cause a denial of service or possibly execute arbitrary code.
Affected Products
15 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| ZlibZlib | 1.1.4 | 1:1.1.4-10 |
| rootio-zlibrootio | See advisory | 1:1.1.4-10 |
Patched Releases
rootio-zlib
1:1.1.4-10
Zlib
1:1.1.4-10
Timeline
Publicly disclosed
Mar 7, 2003
Last updated
Aug 4, 2026
References
- advisorysecurity-tracker.debian.org · CVE-2003-0107
- advisoryRHSA-2003:079
- advisoryRHSA-2003:081
- advisoryzlib-gzprintf-bo(11381)
- exploit20030222 buffer overrun in zlib 1.1.4
FAQ
Common Questions.
Buffer overflow in the gzprintf function in zlib 1.1.4, when zlib is compiled without vsnprintf or when long inputs are truncated using vsnprintf, allows attackers to cause a denial of service or possibly execute arbitrary code.
Affected: Zlib versions 1.1.4; rootio-zlib. 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.
Fixed versions are available, including rootio-zlib 1:1.1.4-10, Zlib 1:1.1.4-10.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Is CVE-2003-0107 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.
Request A Demo