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Vulnerabilities

Vulnerability · CVE-2019-19906

cyrus-sasl (aka Cyrus SASL) 2.1.27 has an out-of-bounds write leading to unauthenticated remote denial-of-service in OpenLDAP via a malformed LDAP packet.

Published Dec 19, 2019 · catalog updated Oct 14, 2026 · cyrus-sasl (aka Cyrus SASL)

Check if you run it

No confirmed exploitation is on record for CVE-2019-19906. EPSS is 8.04%. Act only if a listed version of cyrus-sasl (aka Cyrus SASL) is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (cyrus-sasl (aka Cyrus SASL)).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
8.04%
Remediation
Advisory link
Affected products
cpe apache/bookkeeper · cpe apple/ipados · cpe canonical/ubuntu linux · cpe cyrusimap/cyrus-sasl · cpe debian/debian linux · cpe fedoraproject/fedora

cyrus-sasl (aka Cyrus SASL) 2.1.27 has an out-of-bounds write leading to unauthenticated remote denial-of-service in OpenLDAP via a malformed LDAP packet. The OpenLDAP crash is ultimately caused by an off-by-one error in _sasl_add_string in common.c in cyrus-sasl.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe apache/bookkeeper4.12.1
  • cpe apple/ipados13.6
  • cpe canonical/ubuntu linux12.04
  • cpe canonical/ubuntu linux14.04
  • cpe canonical/ubuntu linux16.04
  • cpe canonical/ubuntu linux18.04
  • cpe cyrusimap/cyrus-saslversion unspecified
  • cpe debian/debian linux10.0
  • cpe debian/debian linux8.0
  • cpe debian/debian linux9.0
  • cpe fedoraproject/fedora31
  • cpe redhat/jboss enterprise web server2.0.0

How to fix CVE-2019-19906

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-2019-19906. EPSS is 8.04%. Act only if a listed version of cyrus-sasl (aka Cyrus SASL) is installed.

Which versions are affected?

Compare what you have installed with canonical/ubuntu linux 12.04; canonical/ubuntu linux 14.04; canonical/ubuntu linux 16.04; canonical/ubuntu linux 18.04. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-193; CWE-787: Out-of-bounds Write. EPSS 8.04%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

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

Timeline

Detection, updates, and resolution for this record.

  1. Dec 19, 2019 · NIST NVD

    Detected

    cyrus-sasl (aka Cyrus SASL) 2.1.27 has an out-of-bounds write leading to unauthenticated remote denial-of-service in OpenLDAP via a malformed LDAP packet. The OpenLDAP crash is ultimately caused by an off-by-one error in _sasl_add_string in common.c in cyrus-sasl.

  2. Oct 14, 2026 · NIST NVD

    Updated

    cyrus-sasl (aka Cyrus SASL) 2.1.27 has an out-of-bounds write leading to unauthenticated remote denial-of-service in OpenLDAP via a malformed LDAP packet. The OpenLDAP crash is ultimately caused by an off-by-one error in _sasl_add_string in common.c in cyrus-sasl.

Sources

  • CVE.orgVulnerability recordCVE-2019-19906

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2019-19906

    30-day exploitation probability 8.0%

    first.org
  • NIST NVDVulnerability recordCVE-2019-19906

    cyrus-sasl (aka Cyrus SASL) 2.1.27 has an out-of-bounds write leading to unauthenticated remote denial-of-service in OpenLDAP via a malformed LDAP packet. The OpenLDAP crash is ultimately caused by an off-by-one error in _sasl_add_string in common.c in cyrus-sasl.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.