CVE-2021-37354Public exploitNetwork attack vector

Device crash via unchecked TIMEZONE copy

Published Feb 15, 2022 · Updated Aug 4, 2024

Stack buffer overflow in Xerox Phaser 4622 35.013.01.000 allows attackers to crash the device via a crafted TIMEZONE value. The sub_3226AC function passes the environment value to strcpy, which copies it into a fixed-size stack buffer without a length check. Exploitation requires setting TIMEZONE through the device's setenv utility and then invoking time; the published CVE confirms denial of service only.

CVSS severity9.8
Critical
EPSS probability1.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in Xerox Phaser 4622 35.013.01.000 allows attackers to crash the device via a crafted TIMEZONE value. The sub_3226AC function passes the environment value to strcpy, which copies it into a fixed-size stack buffer without a length check. Exploitation requires setting TIMEZONE through the device's setenv utility and then invoking time; the published CVE confirms denial of service only.

The record

CVE
CVE-2021-37354
Published
Feb 15, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 15, 2022CVE 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?

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

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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 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-787Out-of-bounds Write
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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