PatchTheCVECVE-2017-17843: An issue was discovered in Enigmail before 1.9.9 that allows remote attackers to trigger use of an intended pu
CVE-2017-17843 is a medium-severity flaw (CVSS 5.9) affecting enigmail, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- Remotely exploitable, no login, no user action
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.9 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.1% (top 34%) |
| CISA exploited list | No |
| Published | 2017-12-27 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2017-17843?
enigmail: upgrade to 1.9.9; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2017-17843 being exploited?
CVE-2017-17843 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2017-17843 affect?
CVE-2017-17843 affects enigmail, debian linux. Severity is medium (CVSS 5.9). 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
How urgent is CVE-2017-17843?
Priority 47/100. Remotely exploitable, no login, no user action; On your watchlist
Software pages
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