CVE-2021-42631Public exploitNetwork attack vector

Pre-auth code execution via unsafe PHP deserialization

Published Jan 31, 2022 · Updated Jul 9, 2026

Object injection in PrinterLogic Web Stack 19.1.1.13 SP9 and earlier allows remote attackers to execute code without authentication. An unauthenticated API endpoint base64-decodes a GET parameter and passes the result to PHP unserialize, allowing a Laravel gadget chain to execute code. The service must be network-reachable, and exploitation runs code as IIS APPPOOL\DefaultAppPool; most deployments are internal and require VPN or equivalent network access.

CVSS severity8.1
High
EPSS probability6.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Object injection in PrinterLogic Web Stack 19.1.1.13 SP9 and earlier allows remote attackers to execute code without authentication. An unauthenticated API endpoint base64-decodes a GET parameter and passes the result to PHP unserialize, allowing a Laravel gadget chain to execute code. The service must be network-reachable, and exploitation runs code as IIS APPPOOL\DefaultAppPool; most deployments are internal and require VPN or equivalent network access.

The record

CVE
CVE-2021-42631
Published
Jan 31, 2022
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-502, 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

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

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1210Exploitation of Remote Services

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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