CVE-2013-4852 Integer overflow in n/a

What is CVE-2013-4852?

CVE-2013-4852 is a medium-severity vulnerability in Debian Debian Linux, published on 19 Aug 2013. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Integer overflow in PuTTY 0.62 and earlier, WinSCP before 5.1.6, and other products that use PuTTY allows remote SSH servers to cause a denial of service (crash) and possibly execute arbitrary code in certain applications that use PuTTY via a negative size value in an RSA key signature during the SSH handshake, which triggers a heap-based buffer overflow.

Weakness: CWE-189

Which versions are affected by CVE-2013-4852?

It affects 5 products.

Products include Debian Debian Linux, Opensuse Opensuse, Putty Putty, Simon Tatham Putty, Winscp Winscp.

How do I fix CVE-2013-4852?

Upgrade to a fixed version.

Is CVE-2013-4852 being exploited?

There is no known exploitation of CVE-2013-4852 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 DEBIAN-CVE-2013-4852, GHSA-x52x-v8xm-9r9j, UBUNTU-CVE-2013-4852.