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Fencer Vulns
critical 9.8

CVE-2016-2563 in the critical feed json

Stack-based buffer overflow in the SCP command-line utility in PuTTY before 0.67 and KiTTY 0.66.6.3 and earlier allows remote servers to ca…

published 2016-04-07 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-3637

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
32.8%
EPSS 32.8% chance of exploitation in 30 days, percentile 98%
public exploits
1
Exploit-DB

Summary

Stack-based buffer overflow in the SCP command-line utility in PuTTY before 0.67 and KiTTY 0.66.6.3 and earlier allows remote servers to cause a denial of service (stack memory corruption) or execute arbitrary code via a crafted SCP-SINK file-size response to an SCP download request.

Patch / fix

  • putty Debian 14, Debian 13, Debian 12 0.67-1

debian advisories DEBIAN-CVE-2016-2563

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-2016-2563 updated cvss 6.8

putty: old-style scp downloads may allow remote code execution

  • 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

Timeline

  1. First public exploit (EDB-39551)
  2. Published

Exploit prediction

32.80% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-39551 Putty pscp 0.66 - Stack Buffer Overwrite dos, 2016-03-10

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Vulns 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.