How severe is CVE-2021-30072?

CVE-2021-30072 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-2021-30072 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-30072?

CVE-2021-30072 affects Dlink Dir-878 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-30072?

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-2021-30072 published?

CVE-2021-30072 was published on 2021-04-02 and last updated on 2026-06-17.

CVE-2021-30072

CVE-2021-30072 is a critical-severity vulnerability in Dlink Dir-878 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: 1% (70th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Dlink Dir-878 Firmware
Published: 2021-04-02
Last modified: 2026-06-17

Description

An issue was discovered in prog.cgi on D-Link DIR-878 1.30B08 devices. Because strcat is misused, there is a stack-based buffer overflow that does not require authentication.

Frequently asked questions

What is CVE-2021-30072?: An issue was discovered in prog.cgi on D-Link DIR-878 1.30B08 devices. Because strcat is misused, there is a stack-based buffer overflow that does not require authentication.
How severe is CVE-2021-30072?: CVE-2021-30072 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-2021-30072 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-30072?: CVE-2021-30072 affects Dlink Dir-878 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-30072?: 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-2021-30072 published?: CVE-2021-30072 was published on 2021-04-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:dlink:dir-878_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Dlink Dir-878 Firmware

CVE-2023-27720 — Critical (CVSS 9.8): D-Link DIR878 1.30B08 was discovered to contain a stack overflow in the sub_48d630 function. This vulnerability allows…
CVE-2023-24800 — Critical (CVSS 9.8): D-Link DIR878 DIR_878_FW120B05 was discovered to contain a stack overflow in the sub_495220 function. This…
CVE-2023-24799 — Critical (CVSS 9.8): D-Link DIR878 DIR_878_FW120B05 was discovered to contain a stack overflow in the sub_48AF78 function. This…
CVE-2023-24798 — Critical (CVSS 9.8): D-Link DIR878 DIR_878_FW120B05 was discovered to contain a stack overflow in the sub_475FB0 function. This…
CVE-2022-44801 — Critical (CVSS 9.8): D-Link DIR-878 1.02B05 is vulnerable to Incorrect Access Control.
CVE-2022-44202 — Critical (CVSS 9.8): D-Link DIR878 1.02B04 and 1.02B05 are vulnerable to Buffer Overflow.

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