CVE-2020-16094: claws-mail Uncontrolled Recursion
Vulnerability summary
CVE-2020-16094 is a high (CVSS 7.5) Uncontrolled Recursion vulnerability in claws-mail. EPSS estimates a 1.78% chance of exploitation in the next 30 days, higher than 78.2% of scored vulnerabilities. 1 public exploit is recorded.
Public exploit (reference, Date unknown)
Source freshness unavailable
How is this decided?Timeline
- 28-07-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
In imap_scan_tree_recursive in Claws Mail through 3.17.6, a malicious IMAP server can trigger stack consumption because of unlimited recursion into subdirectories during a rebuild of the folder tree.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · AlpineEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
1.78%
Chance of exploitation in the next 30 days
Percentile
78%
Versus all other CVEs
30-day change
No change 0.00 pp
From 1.78% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundExploit Reference (thewildbeast.co.uk)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Alpine1 product
- claws-mail< 3.17.7-r0
Claws-mail1 product
- claws-mail≤ 3.17.6
Debian1 product
- claws-mail< 3.17.7-1
Fedoraproject1 product
- fedoraEOL31 | 32 | 33
Mageia1 product
- claws-mail< 3.17.7-1.mga7
Ubuntu1 product
- claws-mailAll versions (No fix recorded)
6 vendors · 6 products
References
11 links- www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=4313X Refsource MISCExploitIssue TrackingThird Party Advisory
