Buffer overflow in 9bis Kitty
CVE-2016-2563
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.328 (98.3th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.342 · newest: 0.328 · change: -0.014
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- lists.opensuse.org/opensuse-updates/2016-05/msg00131.html (vendor-advisory)
- www.securitytracker.com/id/1035257 (vdb-entry)
- security.gentoo.org/glsa/201606-01 (vendor-advisory)
- www.securityfocus.com/bid/84296 (vdb-entry)
- www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-pscp-sink-sscanf.html (Patch)
- github.com/tintinweb/pub/tree/master/pocs/cve-2016-2563 (Vendor Advisory)
- seclists.org/fulldisclosure/2016/Mar/22 (mailing-list)
Frequently asked questions
- What is CVE-2016-2563?
- CVE-2016-2563 is a critical-severity vulnerability in 9bis Kitty, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2016-04-07.
- How severe is CVE-2016-2563?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2016-2563 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.