CVE catalog

CVE-2018-20187

botan: CVE-2018-20187

Severity: Low · CVSS 2.5CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Published: Dec 18, 2018, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 1.52% · Oct 27, 2026

A side-channel issue was discovered in Botan before 2.9.0. An attacker capable of precisely measuring the time taken for ECC key generation may be able to derive information about the high bits of the secret key, as the function to derive the public point from the secret scalar uses an unblinded Montgomery ladder whose loop iteration count depends on the bitlength of the secret. This issue affects only key generation, not ECDSA signatures or ECDH key agreement.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	botan	trixie	`2.19.5+dfsg-4`	fixed
Debian	botan	bookworm	`2.19.3+dfsg-1+deb12u1`	fixed
Ubuntu	botan1.10	pro	`1.10.5-1`	vulnerable
Ubuntu	botan1.10	pro	`1.10.5-1ubuntu1`	vulnerable
Ubuntu	botan1.10	pro	`1.10.5-1+deb7u1ubuntu0.14.04.1`	vulnerable
Ubuntu	botan1.10	pro	`1.10.5-1+deb7u1ubuntu0.14.04.1+esm1`	vulnerable
Ubuntu	botan	18.04	`2.4.0-3`	vulnerable
Ubuntu	botan	18.04	`2.4.0-4`	vulnerable
Ubuntu	botan	18.04	`2.4.0-5ubuntu1`	vulnerable
Alpine	botan	3.11	`2.9.0-r0`	fixed
Alpine	botan	3.12	`2.9.0-r0`	fixed
Alpine	botan	3.13	`2.9.0-r0`	fixed
Alpine	botan	3.14	`2.9.0-r0`	fixed
Alpine	botan	3.15	`2.9.0-r0`	fixed
Alpine	botan	3.16	`2.9.0-r0`	fixed
Alpine	botan	3.17	`2.9.0-r0`	fixed
Alpine	botan	3.18	`2.9.0-r0`	fixed
Alpine	botan	3.19	`2.9.0-r0`	fixed
Alpine	botan	3.20	`2.9.0-r0`	fixed
Alpine	botan	3.21	`2.9.0-r0`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	botan	source	trixie	`2.9.0-2`	not yet assigned	Not reported	[918732]
Debian	botan	source	bookworm	`2.9.0-2`	not yet assigned	Not reported	[918732]
Alpine	botan	apk	3.11	`2.9.0-r0`	Not reported	ALPINE-CVE-2018-20187	Not reported
Alpine	botan	apk	3.12	`2.9.0-r0`	Not reported	ALPINE-CVE-2018-20187	Not reported
Alpine	botan	apk	3.13	`2.9.0-r0`	Not reported	ALPINE-CVE-2018-20187	Not reported
Alpine	botan	apk	3.14	`2.9.0-r0`	Not reported	ALPINE-CVE-2018-20187	Not reported
Alpine	botan	apk	3.15	`2.9.0-r0`	Not reported	ALPINE-CVE-2018-20187	Not reported
Alpine	botan	apk	3.16	`2.9.0-r0`	Not reported	ALPINE-CVE-2018-20187	Not reported
Alpine	botan	apk	3.17	`2.9.0-r0`	Not reported	ALPINE-CVE-2018-20187	Not reported
Alpine	botan	apk	3.18	`2.9.0-r0`	Not reported	ALPINE-CVE-2018-20187	Not reported
Alpine	botan	apk	3.19	`2.9.0-r0`	Not reported	ALPINE-CVE-2018-20187	Not reported
Alpine	botan	apk	3.20	`2.9.0-r0`	Not reported	ALPINE-CVE-2018-20187	Not reported
Alpine	botan	apk	3.21	`2.9.0-r0`	Not reported	ALPINE-CVE-2018-20187	Not reported

[Debian bug #918732]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[botan]Unknown
Details (2)
- 2.19.3+dfsg-1+deb12u1 · amd64 · bookworm
  Fixed · Fixed: 2.9.0-2
  dsa · botan · debian · bookworm; dsa · botan · debian · 12
- 2.19.3+dfsg-1+deb12u1 · arm64 · bookworm
  Fixed · Fixed: 2.9.0-2
  dsa · botan · debian · bookworm; dsa · botan · debian · 12
[libbotan-2-19]Unknown
Source package: [botan]
Details (2)
- 2.19.3+dfsg-1+deb12u1 · amd64 · bookworm
  Fixed · Fixed: 2.9.0-2
  dsa · botan · debian · bookworm; dsa · botan · debian · 12
- 2.19.3+dfsg-1+deb12u1 · arm64 · bookworm
  Fixed · Fixed: 2.9.0-2
  dsa · botan · debian · bookworm; dsa · botan · debian · 12
[libbotan-2-dev]Unknown
Source package: [botan]
Details (2)
- 2.19.3+dfsg-1+deb12u1 · amd64 · bookworm
  Fixed · Fixed: 2.9.0-2
  dsa · botan · debian · bookworm; dsa · botan · debian · 12
- 2.19.3+dfsg-1+deb12u1 · arm64 · bookworm
  Fixed · Fixed: 2.9.0-2
  dsa · botan · debian · bookworm; dsa · botan · debian · 12
[libbotan-2-doc]Unknown
Source package: [botan]
Details (2)
- 2.19.3+dfsg-1+deb12u1 · all · bookworm
  Fixed · Fixed: 2.9.0-2
  dsa · botan · debian · bookworm; dsa · botan · debian · 12
- 2.19.3+dfsg-1+deb12u1 · all · bookworm
  Fixed · Fixed: 2.9.0-2
  dsa · botan · debian · bookworm; dsa · botan · debian · 12
[python3-botan]Unknown
Source package: [botan]
Details (2)
- 2.19.3+dfsg-1+deb12u1 · amd64 · bookworm
  Fixed · Fixed: 2.9.0-2
  dsa · botan · debian · bookworm; dsa · botan · debian · 12
- 2.19.3+dfsg-1+deb12u1 · arm64 · bookworm
  Fixed · Fixed: 2.9.0-2
  dsa · botan · debian · bookworm; dsa · botan · debian · 12

[Debian 13 (Trixie)]

[botan]Unknown
Source package: [botan3]
Details (4)
- 3.7.1+dfsg-2 · amd64 · trixie
  Fixed · Fixed: 2.9.0-2
  dsa · botan · debian · 13
- 3.7.1+dfsg-2 · arm64 · trixie
  Fixed · Fixed: 2.9.0-2
  dsa · botan · debian · 13
- 3.12.0+dfsg-2~deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 2.9.0-2
  dsa · botan · debian · 13
- 3.12.0+dfsg-2~deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 2.9.0-2
  dsa · botan · debian · 13
[libbotan-2-19]Unknown
Source package: [botan]
Details (2)
- 2.19.5+dfsg-4 · amd64 · trixie
  Fixed · Fixed: 2.9.0-2
  dsa · botan · debian · 13
- 2.19.5+dfsg-4 · arm64 · trixie
  Fixed · Fixed: 2.9.0-2
  dsa · botan · debian · 13
[libbotan-2-dev]Unknown
Source package: [botan]
Details (2)
- 2.19.5+dfsg-4 · amd64 · trixie
  Fixed · Fixed: 2.9.0-2
  dsa · botan · debian · 13
- 2.19.5+dfsg-4 · arm64 · trixie
  Fixed · Fixed: 2.9.0-2
  dsa · botan · debian · 13
[libbotan-2-doc]Unknown
Source package: [botan]
Details (2)
- 2.19.5+dfsg-4 · all · trixie
  Fixed · Fixed: 2.9.0-2
  dsa · botan · debian · 13
- 2.19.5+dfsg-4 · all · trixie
  Fixed · Fixed: 2.9.0-2
  dsa · botan · debian · 13

Observed: Oct 23, 2026, 5:35:58 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]