CVE-2020-14002: fedoraproject fedora Observable Discrepancy
Vulnerability summary
CVE-2020-14002 is a medium (CVSS 5.9) Observable Discrepancy vulnerability in fedoraproject fedora. EPSS estimates a 3.13% chance of exploitation in the next 30 days, higher than 87.9% of scored vulnerabilities.
Not severe (CVSS 5.9, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 1Timeline
- 29-06-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
PuTTY 0.68 through 0.73 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client).
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · AlpineEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- OSV · UbuntuEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- OSV · DebianEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS trend
Probability
3.13%
Chance of exploitation in the next 30 days
Percentile
88%
Versus all other CVEs
30-day change
No change 0.00 pp
From 3.13% 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
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Mageia3 products
- putty< 0.74-1.mga7
- filezilla< 3.55.0-1.mga8
- libfilezilla< 0.30.0-1.mga8
Alpine1 product
- putty≥ 0.68, < 0.74-r0
Debian1 product
- putty< 0.74-1
Fedoraproject1 product
- fedoraEOL31 | 32
Netapp1 product
Putty1 product
- putty≥ 0.68, ≤ 0.73
Ubuntu1 product
- puttyAll versions (No fix recorded)
7 vendors · 9 products
References
19 links- lists.fedoraproject.org/archives/…Vendor Advisory
- lists.fedoraproject.org/archives/…Vendor Advisory
- security.netapp.com/advisory/ntap-20200717-0003/Third Party Advisory
