CVE catalog

CVE-2020-15309

wolfssl: CVE-2020-15309

Severity: Medium
Published: Aug 21, 2020, 2:15:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.34% · Oct 25, 2026

An issue was discovered in wolfSSL before 4.5.0, when single precision is not employed. Local attackers can conduct a cache-timing attack against public key operations. These attackers may already have obtained sensitive information if the affected system has been used for private key operations (e.g., signing with a private key).

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	wolfssl	sid	`5.9.2-1.2`	fixed
Debian	wolfssl	trixie	`5.7.2-0.1+deb13u2`	fixed
Debian	wolfssl	bookworm	`5.5.4-2+deb12u2`	fixed
Debian	wolfssl	bookworm-security	`5.5.4-2+deb12u3`	fixed
Ubuntu	wolfssl	16.04	`3.4.8+dfsg-1`	vulnerable
Ubuntu	wolfssl	18.04	`3.10.2+dfsg-2`	vulnerable
Ubuntu	wolfssl	18.04	`3.12.0+dfsg-1`	vulnerable
Ubuntu	wolfssl	18.04	`3.12.2+dfsg-1`	vulnerable
Ubuntu	wolfssl	18.04	`3.13.0+dfsg-1`	vulnerable
Ubuntu	wolfssl	20.04	`4.1.0+dfsg-2`	vulnerable
Ubuntu	wolfssl	20.04	`4.2.0+dfsg-1`	vulnerable
Ubuntu	wolfssl	20.04	`4.2.0+dfsg-2`	vulnerable
Ubuntu	wolfssl	20.04	`4.2.0+dfsg-3`	vulnerable
Ubuntu	wolfssl	20.04	`4.3.0+dfsg-2`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	wolfssl	source	sid	`4.5.0+dfsg-1`	not yet assigned	Not reported	[969663]
Debian	wolfssl	source	trixie	`4.5.0+dfsg-1`	not yet assigned	Not reported	[969663]
Debian	wolfssl	source	bookworm	`4.5.0+dfsg-1`	not yet assigned	Not reported	[969663]

[Debian bug #969663]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libwolfssl35]Fixed
Source package: [wolfssl]
Details (4)
- 5.5.4-2+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 4.5.0+dfsg-1
  dsa · wolfssl · debian · bookworm; dsa · wolfssl · debian · 12
- 5.5.4-2+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 4.5.0+dfsg-1
  dsa · wolfssl · debian · bookworm; dsa · wolfssl · debian · 12
- 5.5.4-2+deb12u3 · amd64 · bookworm-security
  Fixed · Fixed: 4.5.0+dfsg-1
  dsa · wolfssl · debian · bookworm; dsa · wolfssl · debian · 12
- 5.5.4-2+deb12u3 · arm64 · bookworm-security
  Fixed · Fixed: 4.5.0+dfsg-1
  dsa · wolfssl · debian · bookworm; dsa · wolfssl · debian · 12
[libwolfssl-dev]Fixed
Source package: [wolfssl]
Details (4)
- 5.5.4-2+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 4.5.0+dfsg-1
  dsa · wolfssl · debian · bookworm; dsa · wolfssl · debian · 12
- 5.5.4-2+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 4.5.0+dfsg-1
  dsa · wolfssl · debian · bookworm; dsa · wolfssl · debian · 12
- 5.5.4-2+deb12u3 · amd64 · bookworm-security
  Fixed · Fixed: 4.5.0+dfsg-1
  dsa · wolfssl · debian · bookworm; dsa · wolfssl · debian · 12
- 5.5.4-2+deb12u3 · arm64 · bookworm-security
  Fixed · Fixed: 4.5.0+dfsg-1
  dsa · wolfssl · debian · bookworm; dsa · wolfssl · debian · 12

[Debian 13 (Trixie)]

[libwolfssl42t64]Fixed
Source package: [wolfssl]
Details (2)
- 5.7.2-0.1+deb13u1 · amd64 · trixie
  Fixed · Fixed: 4.5.0+dfsg-1
  dsa · wolfssl · debian · 13
- 5.7.2-0.1+deb13u1 · arm64 · trixie
  Fixed · Fixed: 4.5.0+dfsg-1
  dsa · wolfssl · debian · 13
[libwolfssl-dev]Fixed
Source package: [wolfssl]
Details (2)
- 5.7.2-0.1+deb13u1 · amd64 · trixie
  Fixed · Fixed: 4.5.0+dfsg-1
  dsa · wolfssl · debian · 13
- 5.7.2-0.1+deb13u1 · arm64 · trixie
  Fixed · Fixed: 4.5.0+dfsg-1
  dsa · wolfssl · debian · 13

Observed: Oct 23, 2026, 5:48:13 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database]