How severe is CVE-2021-36754?

CVE-2021-36754 has a CVSS score of 7.5/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2021-36754?

Affected package information for CVE-2021-36754 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2021-36754?

No fixed version has been published for CVE-2021-36754 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2021-36754 actively exploited in the wild?

No public exploit code has been indexed for CVE-2021-36754 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2021-36754?

CVE-2021-36754 has an EPSS (Exploit Prediction Scoring System) score of 92.2%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

When was CVE-2021-36754 published, and has it been updated?

CVE-2021-36754 was published on July 30, 2021 and was last updated on April 2, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CVE-2021-36754: high severity vulnerability (CVSS 7.5)

EPSS Exploitation Probability

via FIRST.org ↗

92.2%probability of exploitation in next 30 days

Very High Risk100th percentile+0.35%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

PowerDNS Authoritative Server 4.5.0 before 4.5.1 allows anybody to crash the process by sending a specific query (QTYPE 65535) that causes an out-of-bounds exception.

Frequently Asked Questions

PowerDNS Authoritative Server 4.5.0 before 4.5.1 allows anybody to crash the process by sending a specific query (QTYPE 65535) that causes an out-of-bounds exception.

O3 Security · Impact-Aware SCA

Is CVE-2021-36754 in your stack?

O3 detects CVE-2021-36754 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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