CVE-2021-33945

CVE-2021-33945 is a critical-severity vulnerability in Ricoh Sp 320dn Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

• Severity: Critical (CVSS 3.x base score 9.8)
• CVSS v2: 7.5
• EPSS exploit prediction: 2% (77th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-787
• Affected product: Ricoh Sp 320dn Firmware
• Published: 2022-02-15
• Last modified: 2026-06-17

Description

RICOH Printer series SP products 320DN, SP 325DNw, SP 320SN, SP 320SFN, SP 325SNw, SP 325SFNw, SP 330SN, Aficio SP 3500SF, SP 221S, SP 220SNw, SP 221SNw, SP 221SF, SP 220SFNw, SP 221SFNw v1.06 were discovered to contain a stack buffer overflow in the file /etc/wpa_supplicant.conf. This vulnerability allows attackers to cause a Denial of Service (DoS) via crafted overflow data.

Frequently asked questions

What is CVE-2021-33945?

RICOH Printer series SP products 320DN, SP 325DNw, SP 320SN, SP 320SFN, SP 325SNw, SP 325SFNw, SP 330SN, Aficio SP 3500SF, SP 221S, SP 220SNw, SP 221SNw, SP 221SF, SP 220SFNw, SP 221SFNw v1.06 were discovered to contain a stack buffer overflow in the file /etc/wpa_supplicant.conf. This vulnerability allows attackers to cause a Denial of Service (DoS) via crafted overflow data.

How severe is CVE-2021-33945?

CVE-2021-33945 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-33945 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-33945?

CVE-2021-33945 primarily affects Ricoh Sp 320dn Firmware. In total, 74 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-33945?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-33945 published?

CVE-2021-33945 was published on 2022-02-15 and last updated on 2026-06-17.

References

• https://github.com/Ainevsia/CVE-Request/tree/main/Ricoh/1
• https://www.ricoh.com/info/2022/0228_1/

Affected products (74)

• cpe:2.3:o:ricoh:sp_320dn_firmware:1.06:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_325dnw_firmware:1.06:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_320sn_firmware:1.06:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_320sfn_firmware:1.06:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_325snw_firmware:1.06:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_325sfnw_firmware:1.06:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_330sn_firmware:1.06:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:aficio_sp_3500sf_firmware:1.06:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_221s_firmware:1.06:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_220snw_firmware:1.06:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_221snw_firmware:1.06:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_221sf_firmware:1.06:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_220sfnw_firmware:1.06:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_221sfnw_firmware:1.06:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:m_c2000_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:m_c250fwb_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:m_c250fw_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_c260sfnw_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_c262sfnw_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_c261sfnw_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_c250sf_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_c252sf_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:p_c300w_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:p_c301w_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_c260dnw_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_c262dnw_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_c261dnw_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_c250dn_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_c252dn_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:m_320_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:m_320fb_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:m_320f_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:m_2700_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:m_2701_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_330sn_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_330sfn_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_3710sf_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_220snw_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_221snw_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:ricoh:sp_220sfnw_firmware:-:*:*:*:*:*:*:*

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