CVE-2019-9894 Memory corruption in n/a

What is CVE-2019-9894?

CVE-2019-9894 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 21 Mar 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A remotely triggerable memory overwrite in RSA key exchange in PuTTY before 0.71 can occur before host key verification.

Weakness: CWE-320

Which versions are affected by CVE-2019-9894?

It affects 5 products.

Products include Debian Debian Linux, Fedoraproject Fedora, Netapp Oncommand Unified Manager, Opensuse Leap, Putty Putty.

How do I fix CVE-2019-9894?

Upgrade to a fixed version.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2019-9894 being exploited?

There is no known exploitation of CVE-2019-9894 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2019-9894, DEBIAN-CVE-2019-9894, GHSA-pwmv-rrj5-fgmx, UBUNTU-CVE-2019-9894.