Skip to main content
No exploitation reportedFix available

CVE-2023-45287

No exploitation reported by the sources we read.

  • Published2023-12-05
  • Fixed in1.20.0
  • WeaknessCWE-203

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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

dates in UTC
  1. 2023-12-0517:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-45287?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-45287?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Go
BranchAffectedFixed in
1.20< 1.20.01.20.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • buildahAlmaLinux:9all versions · fixed in 2:1.33.6-2.el9and 1 other package
  • buildahAlmaLinux:8all versions · fixed in 1:1.24.6-7.module_el8.9.0+3627+db8ec155and 1 other package
  • buildah-testsAlmaLinux:8all versions · fixed in 1:1.24.6-7.module_el8.9.0+3687+dcd7ef8f
  • cockpit-podmanAlmaLinux:8all versions · fixed in 46-1.module_el8.7.0+3344+5bcd850f
  • conmonAlmaLinux:8all versions · fixed in 2:2.1.4-2.module_el8.9.0+3627+db8ec155
  • conmonAlmaLinux:8all versions · fixed in 2:2.1.4-2.module_el8.9.0+3687+dcd7ef8f
  • container-selinuxAlmaLinux:8all versions · fixed in 2:2.205.0-3.module_el8.9.0+3627+db8ec155
  • containernetworking-pluginsAlmaLinux:9all versions · fixed in 1:1.4.0-2.el9_4

21 more package ranges on OSV.dev

Vendor advisories

  • RHBA-2025:1772 Red Hat Product Security20 products fixed

    Red Hat Bug Fix Advisory: Updated 7.1 container image is now available in the Red Hat Ecosystem Catalog

  • RHSA-2024:3316 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: Migration Toolkit for Applications security and bug fix update

  • RHSA-2024:2180 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: runc security update

  • RHSA-2024:1859 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: OpenShift API for Data Protection (OADP) 1.3.1 security and bug fix update

  • RHSA-2024:0269 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: Run Once Duration Override Operator for Red Hat OpenShift 1.1.0 for RHEL 9

  • RHSA-2023:7200 Red Hat Product Security10 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.15.z security update

1 more advisory

Full record on NVD

Fix

  1. Update Go to 1.20.0
  2. Vendor fix Red Hat Product Security RHBA-2025:1772 · 20 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/2789521 For supported configurations, refer to: https://access.redhat.com/articles/1548993
  3. Vendor fix Red Hat Product Security RHSA-2024:3316 · 2 productsFor details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  4. Vendor fix Red Hat Product Security RHSA-2024:2180 · 13 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  5. Vendor fix Red Hat Product Security RHSA-2024:1859 · 4 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  6. Vendor fix Red Hat Product Security RHSA-2023:7200 · 10 productsFor Red Hat build of MicroShift 4.15, read the following documentation for important instructions on how to install the latest RPMs and fully apply this asynchronous errata update: https://access.redhat.com/documentation/en-us/red_hat_build_of_microshift/4.15/html/release_notes/index
  7. Vendor fix Red Hat Product Security RHSA-2023:7201 · 243 productsFor OpenShift Container Platform 4.15 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.15/release_notes/ocp-4-1…

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVSS 3.17.5read 2026-10-23
  • NVDweakness (CWE)CWE-203read 2026-10-23
  • FIRST EPSSEPSS score1.3 %2026-10-23
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2023-12-05
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2023-45287?

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.

Is CVE-2023-45287 actively exploited?

Active exploitation of CVE-2023-45287 has not been confirmed. Its EPSS score was 1.3% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-45287?

CVE-2023-45287 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Running runc? Hear about its next vulnerability

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this productCISA KEV additions, October 2026Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database