HOMEVULNERABILITIESCVE-2021-31776
HIGH

CVE-2021-31776

CWE-428Published: April 29, 2021· Updated: Jun 17, 2026

7.8
CVSS v3.1

Official Description

Aviatrix VPN Client before 2.14.14 on Windows has an unquoted search path that enables local privilege escalation to the SYSTEM user, if the machine is misconfigured to allow unprivileged users to write to directories that are supposed to be restricted to administrators.

NVD Source

Technical Analysis

CVE-2021-31776 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

aviatrix1 product(s)
vpn client
Microsoft1 product(s)
windows
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://docs.aviatrix.com/Downloads/samlclient.html
ADVISORYhttps://docs.aviatrix.com/Downloads/samlclient.html#windows-win
ADVISORYhttps://docs.aviatrix.com/HowTos/changelog.html#aviatrix-vpn-client-changelog
ADVISORYhttps://docs.aviatrix.com/Downloads/samlclient.html
ADVISORYhttps://docs.aviatrix.com/Downloads/samlclient.html#windows-win
ADVISORYhttps://docs.aviatrix.com/HowTos/changelog.html#aviatrix-vpn-client-changelog

All References (6)

→
https://docs.aviatrix.com/Downloads/samlclient.htmlProduct · Vendor Advisory
→
https://docs.aviatrix.com/Downloads/samlclient.html#windows-winProduct · Vendor Advisory
→
https://docs.aviatrix.com/HowTos/changelog.html#aviatrix-vpn-client-changelogRelease Notes · Vendor Advisory
→
https://docs.aviatrix.com/Downloads/samlclient.htmlProduct · Vendor Advisory
→
https://docs.aviatrix.com/Downloads/samlclient.html#windows-winProduct · Vendor Advisory
→
https://docs.aviatrix.com/HowTos/changelog.html#aviatrix-vpn-client-changelogRelease Notes · Vendor Advisory

Quick Facts

CVE IDCVE-2021-31776
CVSS Score7.8 / 10
SeverityHIGH
WeaknessCWE-428
CISA KEVNo
Affected2 vendor(s)
PublishedApr 29, 2021

Related CVEs (CWE-428)

CVE-2022-36344
9.8
CVE-2019-8459
9.8
CVE-2019-17658
9.8
CVE-2020-14521
9.8
CVE-2022-50935
9.8
CVE-2020-9292
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-31776 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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