Is CVE-2017-17843 in the CISA KEV catalog?

No. CVE-2017-17843 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-17843?

CVE-2017-17843 has a CVSS v3 base score of 5.9 (MEDIUM).

What is the EPSS score for CVE-2017-17843?

CVE-2017-17843 has an EPSS score of 1.12% (62th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-17843?

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

CVE & CISA-KEV Catalog

CVE-2017-17843

MEDIUM

5.9

CVSS v3

NVD

Description

An issue was discovered in Enigmail before 1.9.9 that allows remote attackers to trigger use of an intended public key for encryption, because incorrect regular expressions are used for extraction of an e-mail address from a comma-separated list, as demonstrated by a modified Full Name field and a homograph attack, aka TBE-01-002.

How to fix

Remediation Available

enigmailDebian

Fixed in:2:1.9.9-1CVE-2017-17843

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 ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

1.12%probability of exploitation in 30 days

62ndpercentile

Moderate risk: more likely to be exploited than 62% of all known CVEs.

References

Vendor Advisory1

enigmail.net

Third-Party Advisory2

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.