Buffer overflow in Opengroup Unix

CVE-2019-9895

In PuTTY versions before 0.71 on Unix, a remotely triggerable buffer overflow exists in any kind of server-to-client forwarding.

Vulnerability class: Buffer Overflow

EPSS: 0.026 (83.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2019-9895?
CVE-2019-9895 is a critical-severity vulnerability in Opengroup Unix, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2019-03-21.
How severe is CVE-2019-9895?
Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2019-9895 known to be exploited?
3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.