UpHeron
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Servers and applications

CVE-2015-5296

Samba 3.x and 4.x before 4.1.22, 4.2.x before 4.2.7, and 4.3.x before 4.3.3 supports connections that are encrypted but unsigned, which allows man-in-the-middle attackers to conduct encrypted-to-unencrypted downgrade attacks by modifying the client-server data stream, related to clidfs.c, libsmb_server.c, and smbXcli_base.c.

Severity
Medium 5.4
Published
29 Dec 2015
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
4.1.22, 4.2.7, 4.3.3
Exploit chance
7.3% in the next 30 daysHigher than 94% of CVEs. EPSS by FIRST, 11 Nov 2026
Weakness
Improper input validation (CWE-20)
Attack
Over the network · Only under certain conditions · No login needed · No user action needed
Attacker can
Read some data · Change some data
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
Sources
NVD

Affected software

SoftwareAffected versions
SambaServers and applications · cpe:a:samba:samba
  • From 3.2.0 before 4.1.22
  • From 4.2.0 before 4.2.7
  • From 4.3.0 before 4.3.3

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2015-5296
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2015-5296