How severe is CVE-2022-22278?

CVE-2022-22278 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2022-22278 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-22278?

CVE-2022-22278 primarily affects Sonicwall Tz300p Firmware. In total, 49 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2022-22278?

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

When was CVE-2022-22278 published?

CVE-2022-22278 was published on 2022-04-27 and last updated on 2026-06-17.

CVE-2022-22278

CVE-2022-22278 is a high-severity vulnerability in Sonicwall Tz300p Firmware with a CVSS 3.x base score of 7.5. 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-770.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-770
Affected product: Sonicwall Tz300p Firmware
Published: 2022-04-27
Last modified: 2026-06-17

Description

A vulnerability in SonicOS CFS (Content filtering service) returns a large 403 forbidden HTTP response message to the source address when users try to access prohibited resource this allows an attacker to cause HTTP Denial of Service (DoS) attack

Frequently asked questions

What is CVE-2022-22278?: A vulnerability in SonicOS CFS (Content filtering service) returns a large 403 forbidden HTTP response message to the source address when users try to access prohibited resource this allows an attacker to cause HTTP Denial of Service (DoS) attack
How severe is CVE-2022-22278?: CVE-2022-22278 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2022-22278 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-22278?: CVE-2022-22278 primarily affects Sonicwall Tz300p Firmware. In total, 49 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2022-22278?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2022-22278 published?: CVE-2022-22278 was published on 2022-04-27 and last updated on 2026-06-17.

References

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2022-0004

Affected products (49)

cpe:2.3:o:sonicwall:tz300p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:tz300w_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:tz350_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:tz350w_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nssp_10700_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nssp_11700_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nssp_12400_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nssp_12800_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nssp_13700_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nssp_15700_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:tz370_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:tz370w_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:tz400_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nsv_10_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nsv_100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nsv_1600_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nsv_200_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nsv_25_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nsv_270_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nsv_300_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nsv_400_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nsv_470_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nsv_50_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nsv_800_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nsv_870_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:tz400w_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:tz470_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:tz470w_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:tz500_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nsa_2650_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nsa_2700_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nsa_3650_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nsa_3700_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nsa_4650_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nsa_4700_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nsa_5650_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nsa_5700_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nsa_6650_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nsa_6700_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:nsa_9250_firmware:*:*:*:*:*:*:*:*

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