How severe is CVE-2020-26887?

CVE-2020-26887 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-26887 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-26887?

CVE-2020-26887 affects Avm Fritz!box 7490 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-26887?

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-2020-26887 published?

CVE-2020-26887 was published on 2020-10-23 and last updated on 2026-06-17.

CVE-2020-26887

CVE-2020-26887 is a high-severity vulnerability in Avm Fritz!box 7490 Firmware with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 4.6
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Avm Fritz!box 7490 Firmware
Published: 2020-10-23
Last modified: 2026-06-17

Description

FRITZ!OS before 7.21 on FRITZ!Box devices allows a bypass of a DNS Rebinding protection mechanism.

Frequently asked questions

What is CVE-2020-26887?: FRITZ!OS before 7.21 on FRITZ!Box devices allows a bypass of a DNS Rebinding protection mechanism.
How severe is CVE-2020-26887?: CVE-2020-26887 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-26887 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-26887?: CVE-2020-26887 affects Avm Fritz!box 7490 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-26887?: 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-2020-26887 published?: CVE-2020-26887 was published on 2020-10-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:avm:fritz\!box_7490_firmware:*:*:*:*:*:*:*:*