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Noroxi
NVD / CVE Program· CNA Go

CVE-2023-45287: Before Go 1.20, the RSA based key exchange methods in crypto/tls may exhibit a timing side channel

Noroxi assessment

Priority: Monitor (action score 30/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.2% (FIRST EPSS); higher than 69.3% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Go standard library crypto/tls 1.20.0.

Low priority for now. Upgrade to Go standard library crypto/tls 1.20.0 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Dec 5, 2023
Updated
Jun 17, 2026
EPSS
1.2% · 69th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.2%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2023-45287

When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
golanggo

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • golang gobefore 1.20.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Go). Independent of NVD's CPE analysis and usually ahead of it.

  • Go standard library crypto/tls

    • before 1.20.0affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8aardvark-dnsbefore 2:1.0.1-38.module_el8.9.0+3627+db8ec1552:1.0.1-38.module_el8.9.0+3627+db8ec155
AlmaLinux:8buildahbefore 1:1.24.6-7.module_el8.9.0+3627+db8ec1551:1.24.6-7.module_el8.9.0+3627+db8ec155
AlmaLinux:8buildah-testsbefore 1:1.24.6-7.module_el8.9.0+3687+dcd7ef8f1:1.24.6-7.module_el8.9.0+3687+dcd7ef8f
AlmaLinux:8buildah-testsbefore 1:1.24.6-7.module_el8.9.0+3627+db8ec1551:1.24.6-7.module_el8.9.0+3627+db8ec155
AlmaLinux:8cockpit-podmanbefore 46-1.module_el8.7.0+3344+5bcd850f46-1.module_el8.7.0+3344+5bcd850f
AlmaLinux:8conmonbefore 2:2.1.4-2.module_el8.9.0+3687+dcd7ef8f2:2.1.4-2.module_el8.9.0+3687+dcd7ef8f
AlmaLinux:8conmonbefore 2:2.1.4-2.module_el8.9.0+3627+db8ec1552:2.1.4-2.module_el8.9.0+3627+db8ec155
AlmaLinux:8container-selinuxbefore 2:2.205.0-3.module_el8.9.0+3627+db8ec1552:2.205.0-3.module_el8.9.0+3627+db8ec155
AlmaLinux:8containernetworking-pluginsbefore 1:1.1.1-6.module_el8.9.0+3711+04fcca5e1:1.1.1-6.module_el8.9.0+3711+04fcca5e
AlmaLinux:8containers-commonbefore 2:1-38.module_el8.9.0+3627+db8ec1552:1-38.module_el8.9.0+3627+db8ec155
AlmaLinux:8critbefore 3.15-3.module_el8.6.0+2877+8e437bf53.15-3.module_el8.6.0+2877+8e437bf5
AlmaLinux:8critbefore 3.15-3.module_el8.6.0+3137+d33c3efb3.15-3.module_el8.6.0+3137+d33c3efb
AlmaLinux:8criubefore 3.15-3.module_el8.6.0+2877+8e437bf53.15-3.module_el8.6.0+2877+8e437bf5
AlmaLinux:8criubefore 3.15-3.module_el8.6.0+3137+d33c3efb3.15-3.module_el8.6.0+3137+d33c3efb
AlmaLinux:8criu-develbefore 3.15-3.module_el8.6.0+3137+d33c3efb3.15-3.module_el8.6.0+3137+d33c3efb
AlmaLinux:8criu-develbefore 3.15-3.module_el8.6.0+2877+8e437bf53.15-3.module_el8.6.0+2877+8e437bf5
AlmaLinux:8criu-libsbefore 3.15-3.module_el8.6.0+2877+8e437bf53.15-3.module_el8.6.0+2877+8e437bf5
AlmaLinux:8criu-libsbefore 3.15-3.module_el8.6.0+3137+d33c3efb3.15-3.module_el8.6.0+3137+d33c3efb
AlmaLinux:8crunbefore 1.8.7-1.module_el8.9.0+3683+33eb0feb1.8.7-1.module_el8.9.0+3683+33eb0feb
AlmaLinux:8fuse-overlayfsbefore 1.9-2.module_el8.9.0+3627+db8ec1551.9-2.module_el8.9.0+3627+db8ec155
AlmaLinux:8libslirpbefore 4.4.0-1.module_el8.6.0+3137+d33c3efb4.4.0-1.module_el8.6.0+3137+d33c3efb
AlmaLinux:8libslirpbefore 4.4.0-1.module_el8.6.0+2877+8e437bf54.4.0-1.module_el8.6.0+2877+8e437bf5
AlmaLinux:8libslirp-develbefore 4.4.0-1.module_el8.6.0+2877+8e437bf54.4.0-1.module_el8.6.0+2877+8e437bf5
AlmaLinux:8libslirp-develbefore 4.4.0-1.module_el8.6.0+3137+d33c3efb4.4.0-1.module_el8.6.0+3137+d33c3efb

+96

Same product

golang: all records

Other highest-scoring records for the same primary product.

  • CVE-2018-7187The "go get" implementation in Go 1.9.4, when the -insecure command-line option is used, does not validate the import path (get/vcs.go only
    54Plan
  • CVE-2018-16873In Go before 1.10.6 and 1.11.x before 1.11.3, the "go get" command is vulnerable to remote code execution when executed with the -u flag and
    52Plan
  • CVE-2021-38297Go before 1.16.9 and 1.17.x before 1.17.2 has a Buffer Overflow via large arguments in a function invocation from a WASM module, when GOARCH
    42Plan

Published before and after this one in the same product

  • ← EarlierCVE-2023-45283Nov 9, 2023 · Insecure parsing of Windows paths with a \??\ prefix in path/filepath
    31Monitor
  • ← EarlierCVE-2023-45284Nov 9, 2023 · Incorrect detection of reserved device names on Windows in path/filepath
    21Monitor
  • Later →CVE-2023-39326Dec 6, 2023 · Denial of service via chunk extensions in net/http
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Go standard library crypto/tls1.20.0Vendor (CNA)
almalinux:aardvark-dns2:1.0.1-38.module_el8.9.0+3627+db8ec155 · AlmaLinux:8Package registry (OSV)
almalinux:buildah1:1.24.6-7.module_el8.9.0+3627+db8ec155 · AlmaLinux:8Package registry (OSV)
almalinux:buildah-tests1:1.24.6-7.module_el8.9.0+3627+db8ec155 · AlmaLinux:8Package registry (OSV)
almalinux:cockpit-podman46-1.module_el8.7.0+3344+5bcd850f · AlmaLinux:8Package registry (OSV)
almalinux:conmon2:2.1.4-2.module_el8.9.0+3627+db8ec155 · AlmaLinux:8Package registry (OSV)
almalinux:container-selinux2:2.205.0-3.module_el8.9.0+3627+db8ec155 · AlmaLinux:8Package registry (OSV)
almalinux:containernetworking-plugins1:1.1.1-6.module_el8.9.0+3711+04fcca5e · AlmaLinux:8Package registry (OSV)
almalinux:containers-common2:1-38.module_el8.9.0+3627+db8ec155 · AlmaLinux:8Package registry (OSV)
almalinux:crit3.15-3.module_el8.6.0+3137+d33c3efb · AlmaLinux:8Package registry (OSV)
almalinux:criu3.15-3.module_el8.6.0+2877+8e437bf5 · AlmaLinux:8Package registry (OSV)
almalinux:criu-devel3.15-3.module_el8.6.0+2877+8e437bf5 · AlmaLinux:8Package registry (OSV)
almalinux:criu-libs3.15-3.module_el8.6.0+2877+8e437bf5 · AlmaLinux:8Package registry (OSV)
Go:stdlib1.20.0Package registry (OSV)
red hat:containernetworking-plugins1:1.4.0-1.1.rhaos4.15.el8 · Red Hat:openshift:4.15::el8Package registry (OSV)
red hat:containernetworking-plugins-debuginfo1:1.4.0-1.1.rhaos4.15.el8 · Red Hat:openshift:4.15::el8Package registry (OSV)
red hat:containernetworking-plugins-debugsource1:1.4.0-1.1.rhaos4.15.el8 · Red Hat:openshift:4.15::el8Package registry (OSV)
red hat:microshift0:4.15.0-202402260721.p0.g799289b.assembly.4.15.0.el9 · Red Hat:openshift:4.15::el9Package registry (OSV)
red hat:microshift-greenboot0:4.15.0-202402260721.p0.g799289b.assembly.4.15.0.el9 · Red Hat:openshift:4.15::el9Package registry (OSV)
red hat:microshift-networking0:4.15.0-202402260721.p0.g799289b.assembly.4.15.0.el9 · Red Hat:openshift:4.15::el9Package registry (OSV)
red hat:microshift-olm0:4.15.0-202402260721.p0.g799289b.assembly.4.15.0.el9 · Red Hat:openshift:4.15::el9Package registry (OSV)
red hat:microshift-release-info0:4.15.0-202402260721.p0.g799289b.assembly.4.15.0.el9 · Red Hat:openshift:4.15::el9Package registry (OSV)
red hat:microshift-selinux0:4.15.0-202402260721.p0.g799289b.assembly.4.15.0.el9 · Red Hat:openshift:4.15::el9Package registry (OSV)
red hat:openshift0:4.15.0-202402142009.p0.g6216ea1.assembly.stream.el8 · Red Hat:openshift:4.15::el8Package registry (OSV)
red hat:openshift-clients0:4.15.0-202402070507.p0.g48dcf59.assembly.stream.el8 · Red Hat:openshift:4.15::el8Package registry (OSV)
red hat:openshift-clients-redistributable0:4.15.0-202402070507.p0.g48dcf59.assembly.stream.el8 · Red Hat:openshift:4.15::el8Package registry (OSV)
rocky linux:buildah1:1.24.6-7.module+el8.9.0+1445+07728297 · Rocky Linux:8Package registry (OSV)
rocky linux:cockpit-podman0:46-1.module+el8.9.0+1445+07728297 · Rocky Linux:8Package registry (OSV)
rocky linux:conmon2:2.1.4-2.module+el8.9.0+1445+07728297 · Rocky Linux:8Package registry (OSV)
rocky linux:container-selinux2:2.205.0-3.module+el8.9.0+1445+07728297 · Rocky Linux:8Package registry (OSV)

+8

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-203 · Observable Discrepancy

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records