Is CVE-2021-26928 actively exploited?

No active exploitation of CVE-2021-26928 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-26928 be exploited remotely?

Yes. CVE-2021-26928 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-26928?

CVE-2021-26928 has a CVSS score of 6.8 (MEDIUM).

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MEDIUM

CVE-2021-26928

CWE-306Published: June 4, 2021· Updated: Jun 17, 2026

6.8

CVSS v3.1

Official Description

BIRD through 2.0.7 does not provide functionality for password authentication of BGP peers. Because of this, products that use BIRD (which may, for example, include Tigera products in some configurations, as well as products of other vendors) may have been susceptible to route redirection for Denial of Service and/or Information Disclosure. NOTE: a researcher has asserted that the behavior is within Tigera’s area of responsibility; however, Tigera disagrees

NVD Source

Technical Analysis

CVE-2021-26928 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), availability disruption (denial of service), with a CVSS base score of 6.8.