CVE-2023-45287Before Go 1.20, the RSA based key exchange methods in crypto/tls may exhibit a timing side channel
- 7.5HighCVSS base score
- 1.3%Exploitation in 30 daysEPSS · top 30% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Before Go 1.20, the RSA based TLS key exchanges used the math/big library, which is not constant time. RSA blinding was applied to prevent timing attacks, but analysis shows this may not have been fully effective. In particular it appears as if the removal of PKCS#1 padding may leak timing information, which in turn could be used to recover session key bits. In Go 1.20, the crypto/tls library switched to a fully constant time RSA implementation, which we do not believe exhibits any timing side channels.
Timeline
ID reserved
By Go
- 2 months later
· 2 months later
Published
- 15 months later
· 15 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 1.3% · top 30% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
Go standard library · crypto/tls
- affected < 1.20.0
References
References6
- https://go.dev/issue/20654 (opens in a new tab)x_transferred
- https://go.dev/cl/326012/26 (opens in a new tab)x_transferred
- https://groups.google.com/g/golang-announce/c/QMK8IQALDvA (opens in a new tab)x_transferred
- https://people.redhat.com/~hkario/marvin/ (opens in a new tab)x_transferred
- https://pkg.go.dev/vuln/GO-2023-2375 (opens in a new tab)x_transferred
- https://security.netapp.com/advisory/ntap-20240112-0005/ (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2023-49587 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2023-45287)Record last updated .