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No exploitation reportedFix available

CVE-2019-19906

No exploitation reported by the sources we read.

  • Published2019-12-19
  • Fixed in10.15.6 · 10.13.6
  • WeaknessCWE-193 · CWE-787

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

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.

Timeline

dates in UTC
  1. 2019-12-1918:15CVE publishedNVD

Versions per branch

NVD
Apple mac os x
BranchAffectedFixed in
10.15≥ 10.15.0, < 10.15.610.15.6
10.13< 10.13.610.13.6
10.13≥ 10.13.0, < 10.13.610.13.6
10.14= 10.14.6no fix published
10.13= 10.13.6no fix published
Canonical ubuntu linux
BranchAffectedFixed in
12.4= 12.04no fix published
14.4= 14.04no fix published
16.4= 16.04no fix published
18.4= 18.04no fix published
19.10= 19.10no fix published
Redhat enterprise linux
BranchAffectedFixed in
5.0= 5.0no fix published
6.0= 6.0no fix published
7.0= 7.0no fix published
8.0= 8.0no fix published

16 more products in the sources.

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

  • cyrus-saslTuxCare:OracleLinux:6all versions · fixed in 2.1.23-15.el6_6.2.tuxcare.els2and 8 other packages
  • cyrus-saslTuxCare:CentOS:7all versions · fixed in 2.1.26-24.el7_9.tuxcare.els1and 10 other packages
  • cyrus-saslTuxCare:CentOS:6all versions · fixed in 2.1.23-15.el6_6.2.tuxcare.els2and 8 other packages
  • cyrus-saslSUSE:OpenStack Cloud Crowbar 9all versions · fixed in 2.1.26-8.13.1
  • cyrus-saslSUSE:OpenStack Cloud Crowbar 8all versions · fixed in 2.1.26-8.13.1
  • cyrus-saslSUSE:OpenStack Cloud 9all versions · fixed in 2.1.26-8.13.1
  • cyrus-saslSUSE:OpenStack Cloud 8all versions · fixed in 2.1.26-8.13.1
  • cyrus-saslSUSE:OpenStack Cloud 7all versions · fixed in 2.1.26-8.13.1

70 more package ranges on OSV.dev

Vendor advisories

  • CVE-2019-19906 Red Hat Product Security176 products fixed · 24 known affected

    cyrus-sasl: denial of service in _sasl_add_string function

    cyrus-sasl.src as a component of Red Hat Enterprise Linux 5 · cyrus-sasl as a component of Red Hat Enterprise Linux 6 · cyrus-sasl-devel as a component of Red Hat Enterprise Linux 6 · +21 more

  • ICSA-23-348-10 CISA5 known affected

    Siemens SIMATIC S7-1500

    SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) · +2 more

  • SSA-398330 Siemens ProductCERT5 known affected

    SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5

    SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= V3.1.0 < V3.1.5 · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= V3.1.0 < V3.1.5 · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= V3.1.0 < V3.1.5 · +2 more

  • RHSA-2020:4497 Red Hat Product Security176 products fixed

    Red Hat Security Advisory: cyrus-sasl security, bug fix, and enhancement update

Full record on NVD

Fix

  1. Update Apple mac os x to 10.15.6 · 10.13.6
  2. Vendor fix CISA ICSA-23-348-10 · 5 productsUpdate to V3.1.5 or later version
  3. Vendor fix Siemens ProductCERT SSA-398330 · 1 productUpdate to V3.1.5 or later version
  4. Vendor fix Red Hat Product Security RHSA-2020:4497 · 176 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. Mitigation from the vendor CISA ICSA-23-348-10 · 5 productsOnly build and run applications from trusted sources.
  6. No fix planned, says the vendor Red Hat Product Security CVE-2019-19906 · 12 productsOut of support scope
  7. No fix planned, says the vendor Red Hat Product Security CVE-2019-19906 · 12 productsWill not fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2019-12-19
Last Modified
2026-10-14
NVD status
Modified
GitHub Advisory
GHSA-vc8v-7256-2pfq

Frequently asked questions

What is 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. The OpenLDAP crash is ultimately caused by an off-by-one error in _sasl_add_string in common.c in cyrus-sasl.

Is CVE-2019-19906 actively exploited?

Active exploitation of CVE-2019-19906 has not been confirmed. Its EPSS score was 8.0% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-19906?

CVE-2019-19906 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:N/I:N/A:H.

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