How severe is CVE-2021-20649?

CVE-2021-20649 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-20649 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20649?

CVE-2021-20649 affects Elecom Wrc-300febk-s Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20649?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-20649 published?

CVE-2021-20649 was published on 2021-02-12 and last updated on 2026-06-17.

CVE-2021-20649

CVE-2021-20649 is a medium-severity vulnerability in Elecom Wrc-300febk-s Firmware with a CVSS 3.x base score of 4.8. 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-295.

Key facts

Severity: Medium (CVSS 3.x base score 4.8)
CVSS v2: 5.8
EPSS exploit prediction: 0% (25th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-295
Affected product: Elecom Wrc-300febk-s Firmware
Published: 2021-02-12
Last modified: 2026-06-17

Description

ELECOM WRC-300FEBK-S contains an improper certificate validation vulnerability. Via a man-in-the-middle attack, an attacker may alter the communication response. As a result, an arbitrary OS command may be executed on the affected device.

Frequently asked questions

What is CVE-2021-20649?: ELECOM WRC-300FEBK-S contains an improper certificate validation vulnerability. Via a man-in-the-middle attack, an attacker may alter the communication response. As a result, an arbitrary OS command may be executed on the affected device.
How severe is CVE-2021-20649?: CVE-2021-20649 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-20649 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20649?: CVE-2021-20649 affects Elecom Wrc-300febk-s Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20649?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-20649 published?: CVE-2021-20649 was published on 2021-02-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:elecom:wrc-300febk-s_firmware:-:*:*:*:*:*:*:*

More vulnerabilities in Elecom Wrc-300febk-s Firmware

CVE-2021-20648 — Medium (CVSS 6.8): ELECOM WRC-300FEBK-S allows an attacker with administrator rights to execute arbitrary OS commands via unspecified…
CVE-2021-20647 — Medium (CVSS 6.5): Cross-site request forgery (CSRF) vulnerability in ELECOM WRC-300FEBK-S allows remote attackers to hijack the…

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