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Vulnerabilities

Vulnerability · CVE-2026-63073

ZDI-26-789: OpenSSL CMP Use of Externally-Controlled Format String Information Disclosure Vulnerability

Published Oct 22, 2026 · FreeBSD FreeBSD

Last checked Oct 31, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-63073. EPSS is 1.16%. Act only if a listed version of FreeBSD FreeBSD is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.16%
Remediation
Vendor / distro source
Affected products
FreeBSD FreeBSD

This vulnerability allows remote attackers to disclose sensitive information on affected installations of OpenSSL. Authentication is not required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 6.5. The following CVEs are assigned: CVE-2026-63073.

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2026-63073

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-63073. EPSS is 1.16%. Act only if a listed version of FreeBSD FreeBSD is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 1.16%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

OpenSSL security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Related records

Linked stories and findings that share CVE identifiers or explicit correlation edges.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 17, 2026 · FreeBSD Security

    Detected

    CVE-2026-63073 is named by FreeBSD Security.

Sources

  • CVE.orgVulnerability recordCVE-2026-63073

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-63073

    30-day exploitation probability 1.16%

    first.org
  • FreeBSD SecurityVendor advisoryCVE-2026-63073

    CVE-2026-63073 is named by FreeBSD Security.

    freebsd.org
  • Monitored product advisoriesVendor advisoryCVE-2026-63073

    CVE-2026-63073 is named on the public Monitored product advisories page.

    openssl-library.org
  • Zero Day InitiativeCoordinated disclosureZDI-26-789

    This vulnerability allows remote attackers to disclose sensitive information on affected installations of OpenSSL. Authentication is not required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 6.5. The following CVEs are assigned: CVE-2026-63073.

    zerodayinitiative.com

Freshness

Last verified in this catalog Oct 29, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Monitored product advisoriesOct 31, 2026
  • Zero Day InitiativeOct 29, 2026
  • FreeBSD SecurityOct 25, 2026
  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 17, 2026