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Fencer Vulns
critical 9.8

CVE-2021-24115 json

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

published 2021-02-22 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-11030

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.9%
EPSS 1.9% chance of exploitation in 30 days, percentile 80%
public exploits
0
none known

Summary

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

Patch / fix

  • botan_project botan 2.17.3
  • botan Debian 13, Debian 12 2.17.3+dfsg-1

debian advisories DEBIAN-CVE-2021-24115

  • Botan Package Hub 15 SP2 2.10.0-bp152.4.6.1
  • Botan Package Hub 15 SP2, Package Hub 15 SP1, openSUSE Leap 15.2 2.10.0-bp152.4.3.1

opensuse advisories openSUSE-SU-2021:0794-1openSUSE-SU-2021:0765-1

  • botan Alpine 3.11 2.11.0-r4
  • botan Alpine 3.13, Alpine 3.12 2.11.0-r6
  • botan Alpine 3.21, Alpine 3.20, Alpine 3.19 +5 more 2.17.3-r0

alpine advisories ALPINE-CVE-2021-24115

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-24115 updated cvss 9.8

botan: constant-time computations are not used for certain decoding and encoding operations (base32, base58, base64, and hex).

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.92% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.