CVE-2019-9895
In PuTTY versions before 0.71 on Unix, a remotely triggerable buffer overflow exists in any kind...
In PuTTY versions before 0.71 on Unix, a remotely triggerable buffer overflow exists in any kind of server-to-client forwarding.
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
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
9.8
In PuTTY versions before 0.71 on Unix, a remotely triggerable buffer overflow exists in any kind of server-to-client forwarding.
- Record
CVE-2019-9895- CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-119
- Updated
- 2026-11-02
CVE List No score
In PuTTY versions before 0.71 on Unix, a remotely triggerable buffer overflow exists in any kind of server-to-client forwarding.
- Record
CVE-2019-9895- Updated
- 2026-11-02
EUVDEUVD-2019-19251 No score
In PuTTY versions before 0.71 on Unix, a remotely triggerable buffer overflow exists in any kind of server-to-client forwarding.
- Record
EUVD-2019-19251- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-cgq7-vh72-wc5f
9.8
In PuTTY versions before 0.71 on Unix, a remotely triggerable buffer overflow exists in any kind...
In PuTTY versions before 0.71 on Unix, a remotely triggerable buffer overflow exists in any kind of server-to-client forwarding.
- Record
GHSA-cgq7-vh72-wc5f- CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-119
- Updated
- 2026-11-02
OSVALPINE-CVE-2019-9895
9.8
In PuTTY versions before 0.71 on Unix, a remotely triggerable buffer overflow exists in any kind of server-to-client forwarding.
- Record
ALPINE-CVE-2019-9895- CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-03
OSV
9.8
In PuTTY versions before 0.71 on Unix, a remotely triggerable buffer overflow exists in any kind of server-to-client forwarding.
- Record
CVE-2019-9895- CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Show 5 moreShow less
OSVDEBIAN-CVE-2019-9895
9.8
In PuTTY versions before 0.71 on Unix, a remotely triggerable buffer overflow exists in any kind of server-to-client forwarding.
- Record
DEBIAN-CVE-2019-9895- CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2019-9895
9.8
In PuTTY versions before 0.71 on Unix, a remotely triggerable buffer overflow exists in any kind of server-to-client forwarding.
- Record
UBUNTU-CVE-2019-9895- CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVMGASA-2019-0153 No score
Updated putty/filezilla/wxgtk packages fix security vulnerability
A remotely triggerable memory overwrite in RSA key exchange in PuTTY before 0.71 can occur before host key verification (CVE-2019-9894).
In PuTTY versions before 0.71 on Unix, a remotely triggerable buffer overflow exists in any kind of server-to-client forwarding (CVE-2019-9895).
Multiple denial-of-service attacks that can be triggered by writing to the terminal exist in PuTTY versions before 0.71 (CVE-2019-9897).
Potential recycling of random numbers used in cryptography exists within PuTTY before 0.71 (CVE-2019-9898).
The putty package has been updated to version 0.71 and the filezilla package has been updated and patched to fix these issues.
wxgtk has been updated to fix an assert when starting filezilla.
- Record
MGASA-2019-0153- Updated
- 2026-11-02
OSVopenSUSE-SU-2019:1113-1 No score
Security update for putty
This update for putty fixes the following issues:
Update to new upstream release 0.71 [boo#1129633]
- CVE-2019-9894: Fixed a remotely triggerable memory overwrite in RSA key exchange, which can occur before host key verification potential recycling of random numbers used in cryptography.
- CVE-2019-9895: Fixed a remotely triggerable buffer overflow in any kind of server-to-client forwarding.
- CVE-2019-9897: Fixed multiple denial-of-service attacks that can be triggered by writing to the terminal.
- CVE-2019-9898: Fixed potential recycling of random numbers used in cryptography
- CVE-2019-9896 (Windows only): Fixed hijacking by a malicious help file in the same directory as the executable
- Major rewrite of the crypto code to remove cache and timing side channels.
- Record
openSUSE-SU-2019:1113-1- Updated
- 2026-11-02
OSVopenSUSE-SU-2019:1123-1 No score
Security update for putty
This update for putty fixes the following issues:
Update to new upstream release 0.71 [boo#1129633]
- CVE-2019-9894: Fixed a remotely triggerable memory overwrite in RSA key exchange, which can occur before host key verification potential recycling of random numbers used in cryptography.
- CVE-2019-9895: Fixed a remotely triggerable buffer overflow in any kind of server-to-client forwarding.
- CVE-2019-9897: Fixed multiple denial-of-service attacks that can be triggered by writing to the terminal.
- CVE-2019-9898: Fixed potential recycling of random numbers used in cryptography
- CVE-2019-9896 (Windows only): Fixed hijacking by a malicious help file in the same directory as the executable
- Major rewrite of the crypto code to remove cache and timing side channels.
This update was imported from the openSUSE:Leap:15.0:Update update project.
- Record
openSUSE-SU-2019:1123-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
puttyAlpine:v3.10 |
before 0.71-r0 | 0.71-r0 |
puttyAlpine:v3.11 |
before 0.71-r0 | 0.71-r0 |
puttyAlpine:v3.12 |
before 0.71-r0 | 0.71-r0 |
puttyAlpine:v3.13 |
before 0.71-r0 | 0.71-r0 |
puttyAlpine:v3.14 |
before 0.71-r0 | 0.71-r0 |
puttyAlpine:v3.15 |
before 0.71-r0 | 0.71-r0 |
puttyAlpine:v3.16 |
before 0.71-r0 | 0.71-r0 |
puttyAlpine:v3.17 |
before 0.71-r0 | 0.71-r0 |
puttyAlpine:v3.18 |
before 0.71-r0 | 0.71-r0 |
puttyAlpine:v3.19 |
before 0.71-r0 | 0.71-r0 |
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| Package | Affected | Fixed |
|---|---|---|
puttyAlpine:v3.20 |
before 0.71-r0 | 0.71-r0 |
puttyAlpine:v3.21 |
before 0.71-r0 | 0.71-r0 |
puttyAlpine:v3.22 |
before 0.71-r0 | 0.71-r0 |
puttyAlpine:v3.23 |
before 0.71-r0 | 0.71-r0 |
puttyAlpine:v3.24 |
before 0.71-r0 | 0.71-r0 |
puttyAlpine:v3.6 |
before 0.71-r0 | 0.71-r0 |
puttyAlpine:v3.7 |
before 0.71-r0 | 0.71-r0 |
puttyAlpine:v3.8 |
before 0.71-r0 | 0.71-r0 |
puttyAlpine:v3.9 |
before 0.71-r0 | 0.71-r0 |
puttyDebian:12 |
before 0.70-6 | 0.70-6 |
puttyDebian:13 |
before 0.70-6 | 0.70-6 |
puttyDebian:14 |
before 0.70-6 | 0.70-6 |
puttyDebian:9 From an advisory covering 4 CVEs |
before 0.67-3+deb9u1, plus listed versions 0.67-3 |
0.67-3+deb9u1 |
puttyMageia:6 From an advisory covering 4 CVEs |
before 0.71-1.mga6 | 0.71-1.mga6 |
filezillaMageia:6 From an advisory covering 4 CVEs |
before 3.31.0-1.mga6 | 3.31.0-1.mga6 |
libfilezillaMageia:6 From an advisory covering 4 CVEs |
before 0.12.1-1.mga6 | 0.12.1-1.mga6 |
wxgtkMageia:6 From an advisory covering 4 CVEs |
before 3.0.3.1-1.1.mga6 | 3.0.3.1-1.1.mga6 |
puttyUbuntu:16.04:LTS |
before 0.67-3+deb9u1build0.16.04.1, plus listed versions 0.65-20.66-10.66-20.66-30.66-40.67-10.67-20.67-3build0.16.04.1 |
0.67-3+deb9u1build0.16.04.1 |
puttyUbuntu:18.04:LTS |
All versions, plus listed versions 0.70-10.70-20.70-30.70-4 |
None known |
puttyopenSUSE:Leap 15.0 From an advisory covering 5 CVEs |
before 0.71-lp150.9.1 | 0.71-lp150.9.1 |
puttySUSE:Package Hub 15 From an advisory covering 5 CVEs |
before 0.71-bp150.4.3.1 | 0.71-bp150.4.3.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| affected | OSV | |
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2019-9895 is a critical vulnerability (CVSS 9.8) in Putty, published March 21, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.50%, the 84th percentile. Fixed in putty 0.71-r0.
References
chiark.greenend.org.uk/~sgtatham/putty/changes.html
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LDO3F267P347E6U2IILFCYW7JPTLCCES
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36LWQ3NPFIV7DC7TC4KFPRYRH2OR7SZ2
lists.opensuse.org/opensuse-security-announce/2019-04/msg00004.html
lists.opensuse.org/opensuse-security-announce/2019-04/msg00020.html
seclists.org/bugtraq/2019/Apr/6
Show 23 moreShow less
security.netapp.com/advisory/ntap-20190404-0001
debian.org/security/2019/dsa-4423
nvd.nist.gov/vuln/detail/CVE-2019-9895
lists.fedoraproject.org/archives/list/[email protected]/message/36LWQ3NPFIV7DC7TC4KFPRYRH2OR7SZ2
lists.fedoraproject.org/archives/list/[email protected]/message/LDO3F267P347E6U2IILFCYW7JPTLCCES
github.com/advisories/GHSA-cgq7-vh72-wc5f
security.alpinelinux.org/vuln/CVE-2019-9895
security-tracker.debian.org/tracker/CVE-2019-9895
advisories.mageia.org/MGASA-2019-0153.html
bugs.mageia.org/show_bug.cgi?id=24547
lists.fedoraproject.org/archives/list/[email protected]/thread/LDO3F267P347E6U2IILFCYW7JPTLCCES
lists.fedoraproject.org/archives/list/[email protected]/thread/TBPZ6RAMBOJAKKPJ54MPIPJTXNB2T6FW
trac.wxwidgets.org/ticket/17942
ubuntu.com/security/CVE-2019-9895
cve.org/CVERecord?id=CVE-2019-9895
lists.opensuse.org/archives/list/[email protected]/thread/CA2Q4AK5GQEYMMPK6PCTZM6P7CCCHSSH
bugzilla.suse.com/1129633
suse.com/security/cve/CVE-2019-9894
suse.com/security/cve/CVE-2019-9895
suse.com/security/cve/CVE-2019-9896
suse.com/security/cve/CVE-2019-9897
suse.com/security/cve/CVE-2019-9898
lists.opensuse.org/archives/list/[email protected]/thread/LGXV73N3N22CMABVEV6TXW4UHE243SBS