CVE-2017-16927 — The scp_v0s_accept function in sesman/libscp/libscp_v0

The scp_v0s_accept function in sesman/libscp/libscp_v0.c in the session manager in xrdp through 0.9.4 uses an untrusted integer as a write length, which allows local users to cause a denial of service (buffer overflow and application crash) or possibly have unspecified other impa

01What is this vulnerability?

The scp_v0s_accept function in sesman/libscp/libscp_v0.c in the session manager in xrdp through 0.9.4 uses an untrusted integer as a write length, which allows local users to cause a denial of service (buffer overflow and application crash) or possibly have unspecified other impact via a crafted input stream.

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2017-11-23T06:29:00.210
• Last modified: 2026-05-13T00:24:29.033

09References

• github.com — https://github.com/neutrinolabs/xrdp/pull/958
• groups.google.com — https://groups.google.com/forum/#%21topic/xrdp-devel/PmVfMuy_xBA
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2017/12/msg00005.html
• github.com — https://github.com/neutrinolabs/xrdp/pull/958
• groups.google.com — https://groups.google.com/forum/#%21topic/xrdp-devel/PmVfMuy_xBA
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2017/12/msg00005.html