CVE-2003-0791

CRITICALNVD 9.89.8—

9.8

The Script.prototype.freeze/thaw functionality in Mozilla 1.4 and earlier allows attackers to execute native methods by modifying the string used as input to the script.thaw JavaScript function, which is then deserialized and executed.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 78.8%
KEV: Not listed

Published

October 7, 2003

Last Modified

April 16, 2026

Advisory Details (4)

Auto-updated May 1, 2026

No patch confirmed yet.

generic

http://www.securityfocus.com/advisories/6979

generic

About Secunia Research | Flexera

http://secunia.com/advisories/11103/

generic

221526 - JS Script.thaw is a security hole

https://bugzilla.mozilla.org/show_bug.cgi?id=221526

generic

http://www.securityfocus.com/bid/9322

Data Freshness Timeline

(refreshed 10× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-29 13:40 UTCepss_batch
2026-05-29 13:40 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-27 13:37 UTCepss_batch
2026-05-26 13:41 UTCepss_batch
2026-05-26 13:41 UTCepss_batch
2026-05-24 16:42 UTCepss_batch
2026-05-22 21:15 UTCepss_batch
2026-05-20 22:36 UTCepss_batch
2026-05-20 11:20 UTCepss_batch
2026-05-20 11:20 UTCepss_batch
2026-05-20 07:58 UTCEG score recompute
2026-05-20 07:58 UTCGHSA enrichment
2026-05-20 03:43 UTCEG score recompute
2026-05-20 03:43 UTCGHSA enrichment
2026-05-19 23:27 UTCEG score recompute
2026-05-19 23:27 UTCGHSA enrichment
2026-05-19 19:12 UTCEG score recompute

Frequently asked(5)

What is CVE-2003-0791?

CVE-2003-0791 is a critical vulnerability published on October 7, 2003. The Script.prototype.freeze/thaw functionality in Mozilla 1.4 and earlier allows attackers to execute native methods by modifying the string used as input to the script.thaw JavaScript function, which is then deserialized and executed.

When was CVE-2003-0791 disclosed?

CVE-2003-0791 was first published in the National Vulnerability Database on October 7, 2003, with the most recent update on April 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2003-0791 actively exploited?

CVE-2003-0791 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 78.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2003-0791?

CVE-2003-0791 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2003-0791?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2003-0791, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2003-0791

📅 Published

🔄 Last Modified

📋 Advisory Details (4)

About Secunia Research | Flexera

221526 - JS Script.thaw is a security hole

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2003-0791?

Published

Last Modified

Advisory Details (4)

Frequently asked(5)