CVE-2021-33945Public exploitNetwork attack vector

Service interruption via unchecked configuration-line copy

Published Feb 15, 2022 · Updated Aug 4, 2024

Stack buffer overflow in RICOH SP-series printer firmware 1.06 allows remote attackers to interrupt service through crafted wireless configuration data. The wpa_supplicant_conf_parser function copies each /etc/wpa_supplicant.conf line into a fixed-size stack buffer with strncpy without checking its length. The condition is reached during WPS wireless setup; excessive memory consumption can stop the device or force a reboot.

CVSS severity9.8
Critical
EPSS probability1.85%
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 RICOH SP-series printer firmware 1.06 allows remote attackers to interrupt service through crafted wireless configuration data. The wpa_supplicant_conf_parser function copies each /etc/wpa_supplicant.conf line into a fixed-size stack buffer with strncpy without checking its length. The condition is reached during WPS wireless setup; excessive memory consumption can stop the device or force a reboot.

The record

CVE
CVE-2021-33945
Published
Feb 15, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1499
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

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

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-787Out-of-bounds Write
T1499Endpoint Denial of Service

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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