How severe is CVE-2006-5877?

CVE-2006-5877 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2006-5877 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2006-5877?

CVE-2006-5877 affects Enigmail. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2006-5877?

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-2006-5877 published?

CVE-2006-5877 was published on 2007-02-23 and last updated on 2026-06-16.

CVE-2006-5877

CVE-2006-5877 is a high-severity vulnerability in Enigmail with a CVSS 2.0 base score of 7.8. 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 7.8)
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Enigmail
Published: 2007-02-23
Last modified: 2026-06-16

Description

The enigmail extension before 0.94.2 does not properly handle large, encrypted file e-mail attachments, which allows remote attackers to cause a denial of service (crash), as demonstrated with Mozilla Thunderbird.

Frequently asked questions

What is CVE-2006-5877?: The enigmail extension before 0.94.2 does not properly handle large, encrypted file e-mail attachments, which allows remote attackers to cause a denial of service (crash), as demonstrated with Mozilla Thunderbird.
How severe is CVE-2006-5877?: CVE-2006-5877 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2006-5877 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2006-5877?: CVE-2006-5877 affects Enigmail. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2006-5877?: 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-2006-5877 published?: CVE-2006-5877 was published on 2007-02-23 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:enigmail:enigmail:*:*:*:*:*:*:*:*

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