HOMEVULNERABILITIESCVE-2021-39290
CRITICAL

CVE-2021-39290

CWE-384Published: August 23, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

Certain NetModule devices allow Limited Session Fixation via PHPSESSID. These models with firmware before 4.3.0.113, 4.4.0.111, and 4.5.0.105 are affected: NB800, NB1600, NB1601, NB1800, NB1810, NB2700, NB2710, NB2800, NB2810, NB3700, NB3701, NB3710, NB3711, NB3720, and NB3800.

NVD Source

Technical Analysis

CVE-2021-39290 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

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 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

netmodule16 product(s)
netmodule router softwarenb1600nb1601nb1800nb1810nb2700nb2710nb2800nb2810nb3700nb3701nb3710+4
Source: NVD CPE · 16 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://seclists.org/fulldisclosure/2021/Aug/22
ADVISORYhttps://www.netmodule.com
ADVISORYhttps://seclists.org/fulldisclosure/2021/Aug/22
ADVISORYhttps://www.netmodule.com

All References (4)

→
https://seclists.org/fulldisclosure/2021/Aug/22Exploit · Mailing List · Third Party Advisory
→
https://www.netmodule.comVendor Advisory
→
https://seclists.org/fulldisclosure/2021/Aug/22Exploit · Mailing List · Third Party Advisory
→
https://www.netmodule.comVendor Advisory

Quick Facts

CVE IDCVE-2021-39290
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-384
CISA KEVNo
Affected1 vendor(s)
PublishedAug 23, 2021

Related CVEs (CWE-384)

CVE-2021-20151
10.0
CVE-2024-11317
10.0
CVE-2023-24427
9.8
CVE-2018-18926
9.8
CVE-2018-11714
9.8
CVE-2018-6959
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-39290 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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