How severe is CVE-2003-0553?

CVE-2003-0553 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2003-0553 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2003-0553?

CVE-2003-0553 affects Netscape Navigator. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2003-0553?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2003-0553 published?

CVE-2003-0553 was published on 2003-08-18 and last updated on 2026-06-16.

CVE-2003-0553

CVE-2003-0553 is a high-severity vulnerability in Netscape Navigator with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Netscape Navigator
Published: 2003-08-18
Last modified: 2026-06-16

Description

Buffer overflow in the Client Detection Tool (CDT) plugin (npcdt.dll) for Netscape 7.02 allows remote attackers to execute arbitrary code via an attachment with a long filename.

Frequently asked questions

What is CVE-2003-0553?: Buffer overflow in the Client Detection Tool (CDT) plugin (npcdt.dll) for Netscape 7.02 allows remote attackers to execute arbitrary code via an attachment with a long filename.
How severe is CVE-2003-0553?: CVE-2003-0553 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2003-0553 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2003-0553?: CVE-2003-0553 affects Netscape Navigator. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2003-0553?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2003-0553 published?: CVE-2003-0553 was published on 2003-08-18 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:netscape:navigator:7.0.2:*:*:*:*:*:*:*

More vulnerabilities in Netscape Navigator

CVE-2004-0904 — Critical (CVSS 10.0): Integer overflow in the bitmap (BMP) decoder for Mozilla Firefox before the Preview Release, Mozilla before 1.7.3, and…
CVE-2004-0722 — Critical (CVSS 10.0): Integer overflow in the SOAPParameter object constructor in (1) Netscape version 7.0 and 7.1 and (2) Mozilla 1.6, and…
CVE-2007-3924 — Critical (CVSS 9.3): Argument injection vulnerability in Microsoft Internet Explorer, when running on systems with Netscape installed and…
CVE-2006-4253 — High (CVSS 7.6): Concurrency vulnerability in Mozilla Firefox 1.5.0.6 and earlier allows remote attackers to cause a denial of service…
CVE-2007-4042 — High (CVSS 7.5): Multiple argument injection vulnerabilities in Netscape Navigator 9 allow remote attackers to execute arbitrary…
CVE-2005-1157 — High (CVSS 7.5): Firefox before 1.0.3, Mozilla Suite before 1.7.7, and Netscape 7.2 allows remote attackers to replace existing search…

All CVEs affecting Netscape Navigator →