How severe is CVE-2017-17847?

CVE-2017-17847 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2017-17847 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-17847?

CVE-2017-17847 primarily affects Enigmail. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-17847?

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-2017-17847 published?

CVE-2017-17847 was published on 2017-12-27 and last updated on 2026-06-17.

CVE-2017-17847

CVE-2017-17847 is a high-severity vulnerability in Enigmail with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-347.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-347
Affected product: Enigmail
Published: 2017-12-27
Last modified: 2026-06-17

Description

An issue was discovered in Enigmail before 1.9.9. Signature spoofing is possible because the UI does not properly distinguish between an attachment signature, and a signature that applies to the entire containing message, aka TBE-01-021. This is demonstrated by an e-mail message with an attachment that is a signed e-mail message in message/rfc822 format.

Frequently asked questions

What is CVE-2017-17847?: An issue was discovered in Enigmail before 1.9.9. Signature spoofing is possible because the UI does not properly distinguish between an attachment signature, and a signature that applies to the entire containing message, aka TBE-01-021. This is demonstrated by an e-mail message with an attachment that is a signed e-mail message in message/rfc822 format.
How severe is CVE-2017-17847?: CVE-2017-17847 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2017-17847 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-17847?: CVE-2017-17847 primarily affects Enigmail. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-17847?: 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-2017-17847 published?: CVE-2017-17847 was published on 2017-12-27 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:enigmail:enigmail:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

More vulnerabilities in Enigmail

CVE-2006-5877 — High (CVSS 7.8): The enigmail extension before 0.94.2 does not properly handle large, encrypted file e-mail attachments, which allows…
CVE-2019-12269 — High (CVSS 7.5): Enigmail before 2.0.11 allows PGP signature spoofing: for an inline PGP message, an attacker can cause the product to…
CVE-2018-12019 — High (CVSS 7.5): The signature verification routine in Enigmail before 2.0.7 interprets user ids as status/control messages and does not…
CVE-2017-17848 — High (CVSS 7.5): An issue was discovered in Enigmail before 1.9.9. In a variant of CVE-2017-17847, signature spoofing is possible for…
CVE-2017-17846 — High (CVSS 7.5): An issue was discovered in Enigmail before 1.9.9. Regular expressions are exploitable for Denial of Service, because of…
CVE-2017-17845 — High (CVSS 7.3): An issue was discovered in Enigmail before 1.9.9. Improper Random Secret Generation occurs because Math.Random() is…

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