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CVE Record

CVE-2021-39615: D-Link DSR-500N version 1.02 contains hard-coded credentials for undocumented user accounts in the '/etc/pa...

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

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

This flaw affects D-Link DSR-500N firmware version 1.02. It includes hard-coded credentials for undocumented accounts. If an attacker recovers the password behind the stored hash, they could log in through SSH or Telnet and access the device’s embedded Linux system.

Executive priority

Treat this as a targeted legacy-device risk. Prioritize finding and replacing or updating affected DSR-500N units, because successful abuse could give operating-system access to network infrastructure.

Technical view

CVE-2021-39615 reports undocumented hard-coded account credentials in the /etc/passwd file on D-Link DSR-500N version 1.02. Successful password recovery could enable SSH or Telnet login and underlying operating-system access. The record states a fix exists in version 2.12/2 and that affected products are no longer supported.

Likely exposure

Exposure is limited to D-Link DSR-500N devices running firmware 1.02, especially where SSH or Telnet management is enabled or reachable from untrusted networks.

Exploitation context

The provided sources do not show active exploitation, and this CVE is not listed as KEV. Exploitation depends on recovering the cleartext password from the identified hash and reaching SSH or Telnet.

Researcher notes

Evidence is narrow: one model, one firmware version, and a conditional path requiring password recovery plus management-plane reachability. No CVSS, CWE, or KEV exploitation evidence is provided in the source bundle.

Mitigation direction

  • Inventory D-Link DSR-500N devices and firmware versions.
  • Upgrade affected devices to the vendor-stated fixed version if available.
  • Replace devices that cannot be safely updated because support has ended.
  • Disable SSH and Telnet where not required.
  • Restrict management access to trusted administrative networks only.

Validation and detection

  • Confirm whether any DSR-500N devices run firmware 1.02.
  • Verify SSH and Telnet are disabled or tightly restricted.
  • Check device logs for unexpected management logins.
  • Confirm updated or replacement devices are no longer on affected firmware.
  • Review vendor guidance before changing production device configuration.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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Credential and access behavior lookup

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CVE-2021-39615 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

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