CVE-2020-14002

Putty vulnerability

CVSS

5.9

EPSS

3.1%

EPSS pct

87th

Exploited

No known

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).

Affected vendor

Putty

Affected product

Putty

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness type (CWE)

CWE-203

Published

2020-06-29

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, high attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality.

Its EPSS score of 3.1% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 87% of all scored CVEs.

Check your external exposure to CVE-2020-14002

Confirm whether Putty Putty is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2020-14002.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2020-14002

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2020-14002 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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