How severe is CVE-2004-0871?

CVE-2004-0871 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2004-0871 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2004-0871?

CVE-2004-0871 affects Mozilla. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2004-0871?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2004-0871 published?

CVE-2004-0871 was published on 2004-09-16 and last updated on 2026-06-16.

CVE-2004-0871

CVE-2004-0871 is a medium-severity vulnerability in Mozilla with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Mozilla
Published: 2004-09-16
Last modified: 2026-06-16

Description

Mozilla does not prevent cookies that are sent over an insecure channel (HTTP) from also being sent over a secure channel (HTTPS/SSL) in the same domain, which could allow remote attackers to steal cookies and conduct unauthorized activities, aka "Cross Security Boundary Cookie Injection."

Frequently asked questions

What is CVE-2004-0871?: Mozilla does not prevent cookies that are sent over an insecure channel (HTTP) from also being sent over a secure channel (HTTPS/SSL) in the same domain, which could allow remote attackers to steal cookies and conduct unauthorized activities, aka "Cross Security Boundary Cookie Injection."
How severe is CVE-2004-0871?: CVE-2004-0871 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2004-0871 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2004-0871?: CVE-2004-0871 affects Mozilla. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2004-0871?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2004-0871 published?: CVE-2004-0871 was published on 2004-09-16 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:mozilla:mozilla:0.9.2:*:*:*:*:*:*:*

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