HOMEVULNERABILITIESCVE-2021-39615
CRITICAL

CVE-2021-39615

CWE-798Published: August 23, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

D-Link DSR-500N version 1.02 contains hard-coded credentials for undocumented user accounts in the '/etc/passwd' file.If an attacker succeeds in recovering the cleartext password of the identified hash value, he will be able to log in via SSH or Telnet and thus gain access to the underlying embedded Linux operating system on the device. Fixed in version 2.12/2. NOTE: This vulnerability only affects products that are no longer supported by the maintainer

NVD Source

Technical Analysis

CVE-2021-39615 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

dlink2 product(s)
dsr-500n firmwaredsr-500n
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://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10235
ADVISORYhttps://www.dlink.com/en/security-bulletin/
ADVISORYhttps://www.nussko.com/advisories/advisory-2021-08-02.txt
ADVISORYhttps://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10235
ADVISORYhttps://www.dlink.com/en/security-bulletin/
ADVISORYhttps://www.nussko.com/advisories/advisory-2021-08-02.txt

All References (6)

→
https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10235Vendor Advisory
→
https://www.dlink.com/en/security-bulletin/Vendor Advisory
→
https://www.nussko.com/advisories/advisory-2021-08-02.txtExploit · Third Party Advisory
→
https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10235Vendor Advisory
→
https://www.dlink.com/en/security-bulletin/Vendor Advisory
→
https://www.nussko.com/advisories/advisory-2021-08-02.txtExploit · Third Party Advisory

Quick Facts

CVE IDCVE-2021-39615
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-798
CISA KEVNo
Affected1 vendor(s)
PublishedAug 23, 2021

Related CVEs (CWE-798)

CVE-2014-9198
10.0
CVE-2020-1614
10.0
CVE-2026-45336
10.0
CVE-2026-8983
10.0
CVE-2013-3542
10.0
CVE-2021-0248
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-39615 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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