HOMEVULNERABILITIESCVE-2016-3954
MEDIUM

CVE-2016-3954

CWE-200Published: February 6, 2018· Updated: Jun 17, 2026

5.5
CVSS v3.1

Official Description

web2py before 2.14.2 allows remote attackers to obtain the session_cookie_key value via a direct request to examples/simple_examples/status. NOTE: this issue can be leveraged by remote attackers to execute arbitrary code using CVE-2016-3957.

NVD Source

Technical Analysis

CVE-2016-3954 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), with a CVSS base score of 5.5.

From a weakness classification perspective (CWE-200): Information exposure vulnerabilities leak sensitive data to unauthorized actors.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

web2py1 product(s)
web2py
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

ADVISORYhttps://devco.re/blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957/
ADVISORYhttps://devco.re/blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957/

All References (4)

→
https://devco.re/blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957/Exploit · Technical Description · Third Party Advisory
→
https://usn.ubuntu.com/4030-1/
→
https://devco.re/blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957/Exploit · Technical Description · Third Party Advisory
→
https://usn.ubuntu.com/4030-1/

Quick Facts

CVE IDCVE-2016-3954
CVSS Score5.5 / 10
SeverityMEDIUM
WeaknessCWE-200
CISA KEVNo
Affected1 vendor(s)
PublishedFeb 6, 2018

Related CVEs (CWE-200)

CVE-2026-27604
10.0
CVE-2025-53624
10.0
CVE-2011-3497
10.0
CVE-2025-22612
10.0
CVE-2022-29165
10.0
CVE-2008-1252
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2016-3954 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.COM. CVE data is provided under the NVD usage policy.
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