CVE-2021-42635Network attack vector

Pre-auth code execution via hardcoded APP_KEY

Published Jan 31, 2022 · Updated Jul 9, 2026

Hardcoded credentials in PrinterLogic Web Stack 19.1.1.13 SP9 and earlier allow remote attackers to execute code before authentication. The server embeds a fixed APP_KEY, but published records do not disclose how possession of that shared key is converted into an executable request. Exploitation requires network reachability to the Web Stack server, which the reporting researchers state is usually internal, and yields code execution on that server.

CVSS severity8.1
High
EPSS probability5.57%
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 PrinterLogic Web Stack 19.1.1.13 SP9 and earlier allow remote attackers to execute code before authentication. The server embeds a fixed APP_KEY, but published records do not disclose how possession of that shared key is converted into an executable request. Exploitation requires network reachability to the Web Stack server, which the reporting researchers state is usually internal, and yields code execution on that server.

The record

CVE
CVE-2021-42635
Published
Jan 31, 2022
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-798, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 31, 2022CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.1NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3NVDAV:N/AC:M/Au:N/C:C/I:C/A:C

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

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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