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Fencer Vulns
high 7.5

CVE-2019-19906 json

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 malform…

published 2019-12-19 6 y ago modified 2026-10-14 25 d ago also EUVD-2019-9498

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
8.0%
EPSS 8.0% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

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.

Patch / fix

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP V3.1.5
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • cyrus-sasl2 Debian 14, Debian 13, Debian 12 2.1.27+dfsg-2

debian advisories DEBIAN-CVE-2019-19906

  • cyrus-sasl2 Ubuntu 16.04 LTS 2.1.26.dfsg1-14ubuntu0.2
  • cyrus-sasl2 Ubuntu 18.04 LTS 2.1.27~101-g0780600+dfsg-3ubuntu2.1
  • cyrus-sasl2 Ubuntu Pro 14.04 LTS 2.1.25.dfsg1-17ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2019-19906

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • cyrus-sasl RHEL 8 2.1.27-5.el8
  • cyrus-sasl-gs2 RHEL 8 2.1.27-5.el8
  • cyrus-sasl-lib RHEL 8 2.1.27-5.el8
  • cyrus-sasl-md5 RHEL 8 2.1.27-5.el8
  • cyrus-sasl-sql RHEL 8 2.1.27-5.el8
  • cyrus-sasl-ldap RHEL 8 2.1.27-5.el8
  • cyrus-sasl-ntlm RHEL 8 2.1.27-5.el8
  • cyrus-sasl-plain RHEL 8 2.1.27-5.el8

red hat advisories RHSA-2020:4497

  • cyrus-sasl SLES for SAP 15 SP2, SLES for SAP 15 SP1, SLES for SAP 15 +16 more 2.1.26-150000.5.13.1
  • cyrus-sasl-saslauthd SLES for SAP 15 SP2, SLES for SAP 15 SP1, SLES for SAP 15 +16 more 2.1.26-150000.5.13.1
  • cyrus-sasl SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +16 more 2.1.26-8.13.1
  • cyrus-sasl SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 2.1.22-182.26.4.1
  • cyrus-sasl-openssl1 SLES 11-SECURITY 2.1.22-182.26.4.1
  • cyrus-sasl-saslauthd SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 2.1.22-182.26.4.1

suse advisories SUSE-SU-2022:3549-1SUSE-SU-2020:3939-1SUSE-SU-2020:14579-1

  • cyrus-sasl openSUSE Tumbleweed 2.1.27-5.7

opensuse advisories openSUSE-SU-2024:10709-1

  • cyrus-sasl-sql AlmaLinux 8 2.1.27-5.el8

almalinux advisories ALSA-2020:4497

  • cyrus-sasl Rocky Linux 8 2.1.27-5.el8

rocky linux advisories RLSA-2020:4497

  • cyrus-sasl Alpine 3.10 2.1.27-r4
  • cyrus-sasl Alpine 3.24, Alpine 3.23, Alpine 3.22 +11 more 2.1.27-r5
  • cyrus-sasl Alpine 3.8 2.1.26-r15
  • cyrus-sasl Alpine 3.9 2.1.27-r2

alpine advisories ALPINE-CVE-2019-19906

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • cyrus-sasl CBL-Mariner 2.0 2.1.27-10

azure linux advisories AZL-6369

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-19906 updated cvss 7.5

cyrus-sasl: denial of service in _sasl_add_string function

  • Red Hat Enterprise Linux 5 cyrus-sasl Red Hat Enterprise Linux 6 cyrus-sasl, cyrus-sasl-lib, cyrus-sasl-md5, cyrus-sasl-sql, cyrus-sasl-ldap, cyrus-sasl-ntlm, +2 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 cyrus-sasl, cyrus-sasl-gs2, cyrus-sasl-lib, cyrus-sasl-md5, cyrus-sasl-sql, cyrus-sasl-ldap, +4 more
    affected: no fix planned “Will not fix”
  • Red Hat JBoss Enterprise Web Server 2 cyrus-sasl
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) cyrus-sasl-sql 2.1.27-5.el8 Red Hat Enterprise Linux BaseOS (v. 8) cyrus-sasl 2.1.27-5.el8, cyrus-sasl-gs2 2.1.27-5.el8, cyrus-sasl-lib 2.1.27-5.el8, cyrus-sasl-md5 2.1.27-5.el8, cyrus-sasl-ldap 2.1.27-5.el8, cyrus-sasl-ntlm 2.1.27-5.el8, +3 more
    fixed: vendor fix RHSA-2020:4497

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-23-348-10 updated cvss 7.5

Siemens SIMATIC S7-1500

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.0, < 3.1.5
    affected: fixed in V3.1.5, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

8.04% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • openldap.org https://www.openldap.org/its/index.cgi/Incoming?id=9123 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.