THREATPORT/VULNERABILITY/CVE-2017-15271
MEDIUM SEVERITY

CVE-2017-15271

Psftpd vulnerability

CVSS
5.9
EPSS
8.7%
EPSS pct
95th
Exploited
No known
A use-after-free issue could be triggered remotely in the SFTP component of PSFTPd 10.0.4 Build 729. This issue could be triggered prior to authentication. The PSFTPd server did not automatically restart, which enabled attackers to perform a very effective DoS attack against this service. By sending a crafted SSH identification / version string to the server, a NULL pointer dereference could be caused, apparently because of a race condition in the window message handling, performing the cleanup for invalid connections. This incorrect cleanup code has a use-after-free.
Affected vendor
Psftp
Affected product
Psftpd
CVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness type (CWE)
Published
2017-11-15

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, high attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to availability.

Its EPSS score of 8.7% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 95% of all scored CVEs.

Check your external exposure to CVE-2017-15271

  • Confirm whether Psftp Psftpd is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2017-15271.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2017-15271

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2017-15271 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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