Is CVE-2017-17847 in the CISA KEV catalog?

No. CVE-2017-17847 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-17847?

CVE-2017-17847 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2017-17847?

CVE-2017-17847 has an EPSS score of 1.20% (64th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-17847?

Upgrade enigmail on debian 11 to 2:1.9.9-1 or later.

CVE & CISA-KEV Catalog

CVE-2017-17847

HIGH

7.5

CVSS v3

NVD

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.

CWE-347

How to fix

Remediation Available

enigmailDebian

Fixed in:2:1.9.9-1CVE-2017-17847

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploit Intelligence

1.20%probability of exploitation in 30 days

64thpercentile

Moderate risk: more likely to be exploited than 64% of all known CVEs.

References

Vendor Advisory1

enigmail.net

Third-Party Advisory3

Other references2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.