CVE-2020-29324Public exploitNetwork attack vector

Privileged Telnet access via hardcoded firmware credentials

Published Jun 4, 2021 · Updated Aug 4, 2024

Hardcoded credentials in D-Link DIR-895L firmware 1.21b05 allow remote attackers to obtain privileged Telnet access. The etc/init0.d/S80telnetd.sh startup script exposes the Telnet username and points to etc/config/image_sign, where the shared password is stored in cleartext. Access requires network reachability to the router's Telnet service but no prior authentication; the credentials grant privileged access and expose sensitive firmware data.

CVSS severity7.5
High
EPSS probability1.07%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hardcoded credentials in D-Link DIR-895L firmware 1.21b05 allow remote attackers to obtain privileged Telnet access. The etc/init0.d/S80telnetd.sh startup script exposes the Telnet username and points to etc/config/image_sign, where the shared password is stored in cleartext. Access requires network reachability to the router's Telnet service but no prior authentication; the credentials grant privileged access and expose sensitive firmware data.

The record

CVE
CVE-2020-29324
Published
Jun 4, 2021
Updated
Aug 4, 2024
Vendor
D-Link
Product
DIR-895L
Classifications
CWE-312, T1552.001, T1078.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 4, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=v1.21b05

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

D-Link · DIR-895Lversion=v1.21b05

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-312Cleartext Storage of Sensitive Information
T1552.001Unsecured Credentials: Credentials In Files
T1078.001Valid Accounts: Default Accounts

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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