HIGH
CVE-2019-19906
CWE-193Published: December 19, 2019· Updated: Jun 17, 2026
7.5
CVSS v3.1
Official 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.
Technical Analysis
CVE-2019-19906 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Vendors & Products
Apache1 product(s)
bookkeeper
Apple3 product(s)
mac os xipadosiphone os
Canonical1 product(s)
ubuntu linux
CentOS1 product(s)
centos
cyrusimap1 product(s)
cyrus-sasl
Debian1 product(s)
debian linux
Fedora1 product(s)
fedora
Red Hat11 product(s)
jboss enterprise web serverenterprise linuxenterprise linux eusenterprise linux for ibm z systemsenterprise linux for ibm z systems eusenterprise linux for power little endianenterprise linux for power little endian eusenterprise linux server ausenterprise linux server for power little endian update services for sap solutionsenterprise linux server tusenterprise linux server update services for sap solutions
Source: NVD CPE · 32 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (30)
→
http://seclists.org/fulldisclosure/2020/Jul/23Mailing List · Third Party Advisory
→
http://seclists.org/fulldisclosure/2020/Jul/24Mailing List · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2022/02/23/4Mailing List · Patch · Release Notes · Third Party Advisory
→
https://github.com/cyrusimap/cyrus-sasl/issues/587Patch · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2019/12/msg00027.htmlMailing List · Third Party Advisory
→
https://seclists.org/bugtraq/2019/Dec/42Mailing List · Third Party Advisory
→
https://support.apple.com/kb/HT211288Third Party Advisory
→
https://support.apple.com/kb/HT211289Third Party Advisory
→
https://usn.ubuntu.com/4256-1/Patch · Third Party Advisory
→
https://www.debian.org/security/2019/dsa-4591Third Party Advisory
→
https://www.openldap.org/its/index.cgi/Incoming?id=9123Exploit · Third Party Advisory
Quick Facts
CVE IDCVE-2019-19906
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-193
CISA KEVNo
Affected8 vendor(s)
PublishedDec 19, 2019
Related CVEs (CWE-193)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2019-19906 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.