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CVE-2019-17069

PuTTY before 0.73 might allow remote SSH-1 servers to cause a denial of service by accessing...

7.5 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

2.25%Up 0.7 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 7.5

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.

Record
CVE-2019-17069
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-416
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2019-17069
Updated
2026-11-02
EUVDEUVD-2019-7540 No score

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.

Record
EUVD-2019-7540
Updated
2026-11-03
GitHub AdvisoriesGHSA-9fg2-hvwm-63r7 7.5

PuTTY before 0.73 might allow remote SSH-1 servers to cause a denial of service by accessing...

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.

Record
GHSA-9fg2-hvwm-63r7
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-20, CWE-416
Updated
2026-11-02
OSVALPINE-CVE-2019-17069 7.5

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.

Record
ALPINE-CVE-2019-17069
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-03
OSV 7.5

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.

Record
CVE-2019-17069
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
Show 7 moreShow less
OSVDEBIAN-CVE-2019-17069 7.5

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.

Record
DEBIAN-CVE-2019-17069
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2019-17069 7.5

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.

Record
UBUNTU-CVE-2019-17069
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVMGASA-2020-0003 No score

Updated putty packages fix security vulnerabilities

Updated putty package fixes security vulnerabilities:

Two separate vulnerabilities affecting the obsolete SSH-1 protocol, both available before host key checking.

Vulnerability in all the SSH client tools (PuTTY, Plink, PSFTP, and PSCP) if a malicious program can impersonate Pageant.

Crash in GSSAPI / Kerberos key exchange triggered if the server provided an ordinary SSH host key as part of the exchange.

Insufficient handling of terminal escape sequences, that should delimit the pasted data in bracketed paste mode (CVE-2019-17068).

Possible information leak caused by SSH-1 disconnection messages (CVE-2019-17069).

The putty package has been updated to version 0.73, fixing theese issues and other bugs.

Record
MGASA-2020-0003
Updated
2026-11-02
OSVopenSUSE-SU-2019:2276-1 No score

Security update for putty

This update for putty to version 0.73 fixes the following issues:

Security issues fixed:

  • CVE-2019-17068: Fixed the insufficient handling of terminal escape sequences, that should delimit the pasted data in bracketed paste mode (boo#1152753).
  • CVE-2019-17069: Fixed a possible information leak caused by SSH-1 disconnection messages (boo#1152753).
Record
openSUSE-SU-2019:2276-1
Updated
2026-11-02
OSVopenSUSE-SU-2019:2277-1 No score

Security update for putty

This update for putty to version 0.73 fixes the following issues:

  • CVE-2019-17068: Fixed the insufficient handling of terminal escape sequences, that should delimit the pasted data in bracketed paste mode (boo#1152753).
  • CVE-2019-17069: Fixed a possible information leak caused by SSH-1 disconnection messages (boo#1152753).
Record
openSUSE-SU-2019:2277-1
Updated
2026-11-02
OSVopenSUSE-SU-2019:2292-1 No score

Security update for putty

This update for putty to version 0.73 fixes the following issues:

Security issues fixed:

  • CVE-2019-17068: Fixed the insufficient handling of terminal escape sequences, that should delimit the pasted data in bracketed paste mode (boo#1152753).
  • CVE-2019-17069: Fixed a possible information leak caused by SSH-1 disconnection messages (boo#1152753).

This update was imported from the openSUSE:Leap:15.0:Update update project.

Record
openSUSE-SU-2019:2292-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:11201-1 No score

putty-0.76-1.2 on GA media

These are all security issues fixed in the putty-0.76-1.2 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11201-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
putty
Alpine:v3.10
 before 0.73-r0
0.73-r0
putty
Alpine:v3.11
 before 0.73-r0
0.73-r0
putty
Alpine:v3.12
 before 0.73-r0
0.73-r0
putty
Alpine:v3.13
 before 0.73-r0
0.73-r0
putty
Alpine:v3.14
 before 0.73-r0
0.73-r0
putty
Alpine:v3.15
 before 0.73-r0
0.73-r0
putty
Alpine:v3.16
 before 0.73-r0
0.73-r0
putty
Alpine:v3.17
 before 0.73-r0
0.73-r0
putty
Alpine:v3.18
 before 0.73-r0
0.73-r0
putty
Alpine:v3.19
 before 0.73-r0
0.73-r0
Show 19 moreShow less
Affected packages
PackageAffectedFixed
putty
Alpine:v3.20
 before 0.73-r0
0.73-r0
putty
Alpine:v3.21
 before 0.73-r0
0.73-r0
putty
Alpine:v3.22
 before 0.73-r0
0.73-r0
putty
Alpine:v3.23
 before 0.73-r0
0.73-r0
putty
Alpine:v3.24
 before 0.73-r0
0.73-r0
putty
Alpine:v3.8
 before 0.73-r0
0.73-r0
putty
Alpine:v3.9
 before 0.73-r0
0.73-r0
putty
Debian:12
 before 0.73-1
0.73-1
putty
Debian:13
 before 0.73-1
0.73-1
putty
Debian:14
 before 0.73-1
0.73-1
putty
Debian:10
 before 0.74-1+deb11u1~deb10u1, plus listed versions
0.70-60.71-10.72-10.72-20.73-10.73-20.73-30.74-1
0.74-1+deb11u1~deb10u1
putty
Mageia:7
 before 0.73-1.mga7
0.73-1.mga7
putty
Ubuntu:16.04:LTS
 All versions, plus listed versions
0.65-20.66-10.66-20.66-30.66-4
Show 4 moreShow less
0.67-10.67-20.67-3build0.16.04.10.67-3+deb9u1build0.16.04.1
 None known
putty
Ubuntu:18.04:LTS
 All versions, plus listed versions
0.70-10.70-20.70-30.70-4
 None known
putty
openSUSE:Leap 15.0
 before 0.73-lp150.18.1
0.73-lp150.18.1
putty
openSUSE:Leap 15.1
 before 0.73-lp151.3.6.1
0.73-lp151.3.6.1
putty
SUSE:Package Hub 15
 before 0.73-bp151.4.6.1
0.73-bp151.4.6.1
putty
SUSE:Package Hub 15 SP1
 before 0.73-bp151.4.6.1
0.73-bp151.4.6.1
putty
openSUSE:Tumbleweed
 before 0.76-1.2
0.76-1.2

History

History
RecordedChangedSources
affectedOSV
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-17069 is a high vulnerability (CVSS 7.5) in Putty, published October 1, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.25%, the 82nd percentile. Fixed in putty 0.73-r0.

References

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