CVE-2021-24115

CRITICALNVD 9.89.8—

9.8

In Botan before 2.17.3, constant-time computations are not used for certain decoding and encoding operations (base32, base58, base64, and hex).

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 72.6%
KEV: Not listed

Published

February 22, 2021

Last Modified

November 21, 2024

References (6)

cve@mitrehttps://botan.randombit.net/news.html
cve@mitrehttps://github.com/randombit/botan/compare/2.17.2...2.17.3
cve@mitrehttps://github.com/randombit/botan/pull/2549
af854a3a-2127-422b-91ae-364da2661108https://botan.randombit.net/news.html
af854a3a-2127-422b-91ae-364da2661108https://github.com/randombit/botan/compare/2.17.2...2.17.3
af854a3a-2127-422b-91ae-364da2661108https://github.com/randombit/botan/pull/2549

Data Freshness Timeline

(refreshed 13× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:15 UTCEPSS rescore
2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-24115?

CVE-2021-24115 is a critical vulnerability published on February 22, 2021. In Botan before 2.17.3, constant-time computations are not used for certain decoding and encoding operations (base32, base58, base64, and hex).

When was CVE-2021-24115 disclosed?

CVE-2021-24115 was first published in the National Vulnerability Database on February 22, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-24115 actively exploited?

CVE-2021-24115 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 72.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-24115?

CVE-2021-24115 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2021-24115?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-24115, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2021-24115

📅 Published

🔄 Last Modified

🔗 References (6)