CVE-2023-28321

MEDIUMNVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

Score 5.9 from GitHub Security Advisory published 2023-05-26. NVD baseline CVSS 5.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
5.9
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 2%CVSS: 5.9Exploit: NoneExposed: 0

A fix is available — apply it.

An improper certificate validation vulnerability exists in curl xn-- and should not be allowed to pattern match, but the wildcard check in curl could still check for x*, which would match even though the IDN name most likely contained nothing even resembling an x.

CVSS v3
5.9
EG Score
5.9(medium)
EG Risk
43(Track)
EG Risk 43/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity59% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
76.3%
KEV
Not listed

Published

May 26, 2023

Last Modified

January 15, 2025

References (24)

Patch Availability(8)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibcurl4-openssl-dev (7.47.0-1ubuntu2.19+esm9) @ xenial2026-05-25ubuntu
ubuntucurl (7.68.0-1ubuntu2.19) @ focal2026-05-25ubuntu
redhatcurl-0:7.61.1-22.el8_6.92023-11-02redhat
redhatcurl-0:7.76.1-14.el9_0.72023-10-10redhat
redhatjbcs-httpd24-curl-0:8.2.1-1.el7jbcs2023-08-15redhat
redhatjbcs-httpd24-curl2023-08-15redhat
redhatcurl-0:7.61.1-30.el8_8.32023-08-08redhat
redhatcurl-0:7.76.1-23.el9_2.22023-08-01redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(9)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 15× in last 7d / 49× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 111 total refreshes for this CVE.

  1. 2026-07-24 14:15 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2023-28321?
CVE-2023-28321 is a medium vulnerability published on May 26, 2023. An improper certificate validation vulnerability exists in curl <v8.1.0 in the way it supports matching of wildcard patterns when listed as "Subject Alternative Name" in TLS server certificates. curl can be built to use its own name matching function for TLS rather than one provided by a TLS…
When was CVE-2023-28321 disclosed?
CVE-2023-28321 was first published in the National Vulnerability Database on May 26, 2023, with the most recent update on January 15, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-28321 actively exploited?
CVE-2023-28321 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 76.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-28321?
CVE-2023-28321 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2023-28321?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-28321, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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