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Fencer Vulns
high 7.5

CVE-2019-17069 json

PuTTY before 0.73 might allow remote SSH-1 servers to cause a denial of service by accessing freed memory locations via an SSH1_MSG_DISCONN…

published 2019-10-01 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-7540

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.2%
EPSS 2.2% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

PuTTY before 0.73 might allow remote SSH-1 servers to cause a denial of service by accessing freed memory locations via an SSH1_MSG_DISCONNECT message.

Patch / fix

  • putty putty 0.73
  • putty Debian 14, Debian 13, Debian 12 0.73-1

debian advisories DEBIAN-CVE-2019-17069

  • putty openSUSE Tumbleweed 0.76-1.2
  • putty Package Hub 15 SP1, Package Hub 15 0.73-bp151.4.6.1
  • putty openSUSE Leap 15.1 0.73-lp151.3.6.1
  • putty openSUSE Leap 15.0 0.73-lp150.18.1

opensuse advisories openSUSE-SU-2024:11201-1openSUSE-SU-2019:2292-1openSUSE-SU-2019:2277-1openSUSE-SU-2019:2276-1

  • putty Alpine 3.24, Alpine 3.23, Alpine 3.22 +14 more 0.73-r0

alpine advisories ALPINE-CVE-2019-17069

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-17069 updated cvss 7.5

putty: possible access to freed memory by sending the SSH1_MSG_DISCONNECT message

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.25% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.