How severe is CVE-2021-29296?

CVE-2021-29296 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-2021-29296 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-29296?

CVE-2021-29296 affects Dlink Dir-825 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-29296?

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-2021-29296 published?

CVE-2021-29296 was published on 2021-08-10 and last updated on 2026-06-17.

CVE-2021-29296

CVE-2021-29296 is a high-severity vulnerability in Dlink Dir-825 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-476.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Dlink Dir-825 Firmware
Published: 2021-08-10
Last modified: 2026-06-17

Description

Null Pointer Dereference vulnerability in D-Link DIR-825 2.10b02, which could let a remote malicious user cause a denial of service. The vulnerability could be triggered by sending an HTTP request with URL /vct_wan; the sbin/httpd would invoke the strchr function and take NULL as a first argument, which finally leads to the segmentation fault. NOTE: The DIR-825 and all hardware revisions is considered End of Life and as such this issue will not be patched

Frequently asked questions

What is CVE-2021-29296?: Null Pointer Dereference vulnerability in D-Link DIR-825 2.10b02, which could let a remote malicious user cause a denial of service. The vulnerability could be triggered by sending an HTTP request with URL /vct_wan; the sbin/httpd would invoke the strchr function and take NULL as a first argument, which finally leads to the segmentation fault. NOTE: The DIR-825 and all hardware revisions is considered End of Life and as such this issue will not be patched
How severe is CVE-2021-29296?: CVE-2021-29296 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-2021-29296 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-29296?: CVE-2021-29296 affects Dlink Dir-825 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-29296?: 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-2021-29296 published?: CVE-2021-29296 was published on 2021-08-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:dlink:dir-825_firmware:2.10b02:*:*:*:*:*:*:*

More vulnerabilities in Dlink Dir-825 Firmware

CVE-2025-7206 — Critical (CVSS 9.8): A vulnerability, which was classified as critical, has been found in D-Link DIR-825 2.10. This issue affects the…
CVE-2022-47035 — Critical (CVSS 9.8): Buffer Overflow Vulnerability in D-Link DIR-825 v1.33.0.44ebdd4-embedded and below allows attacker to execute arbitrary…
CVE-2021-46442 — Critical (CVSS 9.8): In the "webupg" binary of D-Link DIR-825 G1, attackers can bypass authentication through parameters "autoupgrade.asp",…
CVE-2019-16920 — Critical (CVSS 9.8): Unauthenticated remote code execution occurs in D-Link products such as DIR-655C, DIR-866L, DIR-652, and DHP-1565. The…
CVE-2026-7068 — High (CVSS 8.8): A vulnerability was identified in D-Link DIR-825 3.00b32. This affects the function NMBD_process of the file sserver.c…
CVE-2025-10666 — High (CVSS 8.8): A security flaw has been discovered in D-Link DIR-825 up to 2.10. Affected by this vulnerability is the function…

All CVEs affecting Dlink Dir-825 Firmware →

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