HOMEVULNERABILITIESCVE-2021-31216
HIGH

CVE-2021-31216

CWE-918Published: July 19, 2021· Updated: Jun 17, 2026

8.1
CVSS v3.1

Official Description

Siren Investigate before 11.1.1 contains a server side request forgery (SSRF) defect in the built-in image proxy route (which is enabled by default). An attacker with access to the Investigate installation can specify an arbitrary URL in the parameters of the image proxy route and fetch external URLs as the Investigate process on the host.

NVD Source

Technical Analysis

CVE-2021-31216 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

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), with a CVSS base score of 8.1.

CVSS v3.1 Vector Breakdown

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

Affected Vendors & Products

siren1 product(s)
investigate
Source: NVD CPE · 1 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

PATCHhttps://docs.siren.io/siren-platform-user-guide/11.1/release-notes.html
PATCHhttps://docs.siren.io/siren-platform-user-guide/11.1/release-notes.html
ADVISORYhttps://community.siren.io/c/announcements
ADVISORYhttps://community.siren.io/c/announcements

All References (4)

→
https://community.siren.io/c/announcementsRelease Notes · Vendor Advisory
→
https://docs.siren.io/siren-platform-user-guide/11.1/release-notes.htmlPatch · Release Notes · Vendor Advisory
→
https://community.siren.io/c/announcementsRelease Notes · Vendor Advisory
→
https://docs.siren.io/siren-platform-user-guide/11.1/release-notes.htmlPatch · Release Notes · Vendor Advisory

Quick Facts

CVE IDCVE-2021-31216
CVSS Score8.1 / 10
SeverityHIGH
WeaknessCWE-918
CISA KEVNo
Affected1 vendor(s)
PublishedJul 19, 2021

Related CVEs (CWE-918)

CVE-2026-40114
10.0
CVE-2026-47938
10.0
CVE-2024-42467
10.0
CVE-2026-62643
10.0
CVE-2026-35431
10.0
CVE-2026-26150
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-31216 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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