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Fencer Intel
medium 6.8

CVE-2013-4852 json

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 den…

published 2013-08-19 13 y ago modified 2026-06-16 4 mo ago also EUVD-2013-4697

cvss
6.8
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.4%
EPSS 3.4% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

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.

Patch / fix

  • putty Debian 14, Debian 13, Debian 12 0.63-1
  • filezilla Debian 14, Debian 13, Debian 12 3.7.3-1

debian advisories DEBIAN-CVE-2013-4852

  • putty Ubuntu 14.04 LTS 0.63-1

ubuntu advisories UBUNTU-CVE-2013-4852

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • putty openSUSE Tumbleweed 0.67-1.5
  • filezilla openSUSE Tumbleweed 3.23.0.2-1.1

opensuse advisories openSUSE-SU-2024:10374-1openSUSE-SU-2024:10399-1

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-2013-4852 updated cvss 7.5

putty: Integer overflow, leading to heap-based buffer overflow during SSH handshake

  • 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

3.45% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness

References

Sources

Fencer Intel 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.