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

Distribution release	Source package	Vendor state	Fixed version	Evidence
Alpine v3.23v3.23 · main	`cyrus-sasl`	Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.	`2.1.27-r5`	Alpine Security Database ↗Source updated 3 Oct 2026
Alpine v3.22v3.22 · main	`cyrus-sasl`	Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.	`2.1.27-r5`	Alpine Security Database ↗Source updated 3 Oct 2026
Alpine v3.21v3.21 · main	`cyrus-sasl`	Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.	`2.1.27-r5`	Alpine Security Database ↗Source updated 3 Oct 2026
Debian trixietrixie · source	`cyrus-sasl2`	Vendor fix publishedDebian records a fixed source-package version for this release.	`2.1.27+dfsg-2`	Debian Security Tracker ↗Source updated 5 Oct 2026
Debian bookwormbookworm · source	`cyrus-sasl2`	Vendor fix publishedDebian records a fixed source-package version for this release.	`2.1.27+dfsg-2`	Debian Security Tracker ↗Source updated 5 Oct 2026
Debian forkyforky · source	`cyrus-sasl2`	Vendor fix publishedDebian records a fixed source-package version for this release.	`2.1.27+dfsg-2`	Debian Security Tracker ↗Source updated 5 Oct 2026
Debian sidsid · source	`cyrus-sasl2`	Vendor fix publishedDebian records a fixed source-package version for this release.	`2.1.27+dfsg-2`	Debian Security Tracker ↗Source updated 5 Oct 2026

Recommended actionWithin 7 days

High technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available

What, why and how

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.

What

Why

A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

What

Why

A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation

Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.

No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material

Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.

Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path: a network path → Off-by-one Error → disrupt the affected service
Attack surface: Network
Privileges required: None: unauthenticated exploitation is possible
User interaction: None
Attack complexity: Low: no specialised conditions are recorded
Security boundary: Unchanged: impact remains within the vulnerable component's security authority
Weakness ? CWE means Common Weakness Enumeration: a standard category for the underlying weakness.: CWE-193 ↗
CWE-193: Off-by-one Error. A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value.
CVSS vector ? CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land: No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.

NetworkUnauthenticatedDenial of serviceCWE-193Public exploit reference

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2019-9498Official EUVD mapping

0 linked advisory records.

Official EUVD record ↗

BSI · German · WID-SEC-2022-1335Xerox FreeFlow Print Server: Mehrere Schwachstellen

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Xerox FreeFlow Print Server ausnutzen, um die Vertraulichkeit, Verfügbarkeit und Integrität des Systems zu gefährden.

Official advisory ↗

BSI · German · WID-SEC-2022-0432Xerox FreeFlow Print Server: Mehrere Schwachstellen

Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Xerox FreeFlow Print Server ausnutzen, um die Vertraulichkeit, Verfügbarkeit und Integrität zu gefährden.

Official advisory ↗

BSI · German · WID-SEC-2022-0302Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen Ausführen von beliebigem Programmcode mit Administratorrechten

Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Xerox FreeFlow Print Server ausnutzen, um beliebigen Programmcode auszuführen, einen Cross-Site-Scripting-Angriff durchzuführen, Informationen offenzulegen, einen Denial-of-Service-Zustand zu verursachen oder Dateien zu manipulieren.

Official advisory ↗

BSI · German · WID-SEC-2025-0227IBM QRadar SIEM: Mehrere Schwachstellen

Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in IBM QRadar SIEM ausnutzen, um seine Privilegien zu erweitern, Administratorrechte zu erlangen, beliebigen Programmcode auszuführen, Informationen offenzulegen, Dateien zu manipulieren oder Sicherheitsvorkehrungen zu umgehen.

Official advisory ↗

CERT-FR · French · CERTFR-2025-AVI-0969Multiples vulnérabilités dans les produits VMware

d?id=CVE-2019-13136 Référence CVE CVE-2019-13147 https://www.cve.org/CVERecord?id=CVE-2019-13147 Référence CVE CVE-2019-13232 https://www.cve.org/CVERecord?id=CVE-2019-13232 Référence CVE CVE-2019-14844 https://www.cve.org/CVERecord?id=CVE-2019-14844 Référence CVE CVE-2019-16775 https://www.cve.org/CVERecord?id=CVE-2019-16775 Référence CVE CVE-2019-16776 https://www.cve.org/CVERecord?id=CVE-2019-16776 Référence CVE CVE-2019-16777 https://www.cve.org/CVERecord?id=CVE-2019-16777 Référence CVE CVE-2019-17547 https://www.cve.org/CVERecord?id=CVE-2019-17547 Référence CVE CVE-2019-18276 https://www.cve.org/CVERecord?id=CVE-2019-18276 Référence CVE CVE-2019-19906 https://www.cve.org/CVERecord?id=CVE-2019-19906 Référence CVE CVE-2019-20838 https://www.cve.org/CVERecord?id=CVE-2019-20838 Référence CVE CVE-2019-25013 https://www.cve.org/CVERecord?id=CVE-2019-25013 Référence CVE CVE-2019-2708 https://www.cve.org/CVERecord?id=CVE-2019-2708 Référence CVE CVE-2019-3792 https://www.cve.org/CVERecord?id=CVE-2019-3792 Référence CVE CVE-2019-6293 https://www.cve.org/CVERecord?id=CVE-2019-6293 Référence CVE CVE-2019-6461 https://www.cve.org/CVERecord?id=CVE-2019-6461 Référence CVE CVE-2019-6462 https://www.cve.org/CVERecord?id=CVE-2019-6462 Référence CVE CVE-2019-8321 https://www.cve.org/CVERecord?id=CVE-2019-83

Official advisory ↗

CERT-FR · French · CERTFR-2023-AVI-1015Multiples vulnérabilités dans les produits Siemens

d?id=CVE-2019-18348 Référence CVE CVE-2019-19126 https://www.cve.org/CVERecord?id=CVE-2019-19126 Référence CVE CVE-2019-19242 https://www.cve.org/CVERecord?id=CVE-2019-19242 Référence CVE CVE-2019-19244 https://www.cve.org/CVERecord?id=CVE-2019-19244 Référence CVE CVE-2019-19317 https://www.cve.org/CVERecord?id=CVE-2019-19317 Référence CVE CVE-2019-19603 https://www.cve.org/CVERecord?id=CVE-2019-19603 Référence CVE CVE-2019-19645 https://www.cve.org/CVERecord?id=CVE-2019-19645 Référence CVE CVE-2019-19646 https://www.cve.org/CVERecord?id=CVE-2019-19646 Référence CVE CVE-2019-19880 https://www.cve.org/CVERecord?id=CVE-2019-19880 Référence CVE CVE-2019-19906 https://www.cve.org/CVERecord?id=CVE-2019-19906 Référence CVE CVE-2019-19923 https://www.cve.org/CVERecord?id=CVE-2019-19923 Référence CVE CVE-2019-19924 https://www.cve.org/CVERecord?id=CVE-2019-19924 Référence CVE CVE-2019-19925 https://www.cve.org/CVERecord?id=CVE-2019-19925 Référence CVE CVE-2019-19926 https://www.cve.org/CVERecord?id=CVE-2019-19926 Référence CVE CVE-2019-19956 https://www.cve.org/CVERecord?id=CVE-2019-19956 Référence CVE CVE-2019-19959 https://www.cve.org/CVERecord?id=CVE-2019-19959 Référence CVE CVE-2019-20218 https://www.cve.org/CVERecord?id=CVE-2019-20218 Référence CVE CVE-2019-20367 https://www.cve.org/CVERecord?id=

Official advisory ↗

CERT-FR · French · CERTFR-2020-AVI-452Multiples vulnérabilités dans les produits Apple

eur pour l'obtention des correctifs (cf. section Documentation). Documentation Bulletin de sécurité Apple HT211288 du 15 juillet 2020 https://support.apple.com/en-us/HT211288 Bulletin de sécurité Apple HT211289 du 15 juillet 2020 https://support.apple.com/en-us/HT211289 Bulletin de sécurité Apple HT211290 du 15 juillet 2020 https://support.apple.com/en-us/HT211290 Bulletin de sécurité Apple HT211291 du 15 juillet 2020 https://support.apple.com/en-us/HT211291 Bulletin de sécurité Apple HT211292 du 15 juillet 2020 https://support.apple.com/en-us/HT211292 Référence CVE CVE-2019-14899 https://www.cve.org/CVERecord?id=CVE-2019-14899 Référence CVE CVE-2019-19906 https://www.cve.org/CVERecord?id=CVE-2019-19906 Référence CVE CVE-2019-20807 https://www.cve.org/CVERecord?id=CVE-2019-20807 Référence CVE CVE-2020-9799 https://www.cve.org/CVERecord?id=CVE-2020-9799 Référence CVE CVE-2020-9862 https://www.cve.org/CVERecord?id=CVE-2020-9862 Référence CVE CVE-2020-9864 https://www.cve.org/CVERecord?id=CVE-2020-9864 Référence CVE CVE-2020-9865 https://www.cve.org/CVERecord?id=CVE-2020-9865 Référence CVE CVE-2020-9866 https://www.cve.org/CVERecord?id=CVE-2020-9866 Référence CVE CVE-2020-9870 https://www.cve.org/CVERecord?id=CVE-2020-9870 Référence CVE CVE-2020-9878 https://www.cve.org/CVERecord?id=CVE-2020-9878

Official advisory ↗

JVN iPedia · Japanese · JVNDB-2022-006310Cyrus SASL における SQL インジェクションの脆弱性

Cyrus SASL には、SQL インジェクションの脆弱性が存在します。

Official advisory ↗

JVN iPedia · Japanese · JVNDB-2019-013663cyrus-sasl における境界条件の判定に関する脆弱性

cyrus-sasl (別名 Cyrus SASL) には、境界条件の判定に関する脆弱性、境界外書き込みに関する脆弱性が存在します。

Official advisory ↗

Patch and workaround

Operational remediation based on structured source evidence.

Status ? Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.: Patch available
Affected: n/a
Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action: Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround: No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.

Evidence and provenance

Published 19 Dec 2019 · Last source change 5 Aug 2024, 02:32 UTC · CWE-193 · Off-by-one Error

CVE recordCVE.org · 5.1

CVSS sourceNIST NVD

EPSS source

The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.

FIRST · tracked since 2026-09-01

European sourceENISA EUVD · EUVD-2019-9498

Product sourceUnavailable

Remediation sourceCVE/CNA references

CWE sourceNIST NVD

NVD statusNVD modified after enrichment

Missing structured fields: affected product. Missing data is not evidence of low risk; review the primary advisory.

Material change intelligence

What changed after publication

View recent updates ↗

1 Sep 2026, 02:42 UTC
ENISA EUVD mappingEUVD-2019-9498 was added to the official ENISA EUVD mapping for this CVE.
Before
not recorded
After
{"euvdId":"EUVD-2019-9498"}
ENISA EUVD ↗
5 Aug 2024, 02:32 UTC
Vendor guidanceAuthoritative vendor guidance changed: added patch: github.com/587; added patch: openwall.com/4; removed vendor advisory: debian.org/dsa-4591; removed vendor advisory: lists.fedoraproject.org/MW6GZCLECGL2PBNHVNPJIX4RPVRVFR7R; 2 further additions; 2 further removals.
Before
vendor advisory: debian.org/dsa-4591 · vendor advisory: lists.fedoraproject.org/MW6GZCLECGL2PBNHVNPJIX4RPVRVFR7R · vendor advisory: lists.fedoraproject.org/OB4GSVOJ6ESHQNT5GSV63OX5D4KPSTGT · 1 more references
After
patch: github.com/587 · patch: openwall.com/4 · patch: usn.ubuntu.com/4256-1 · 1 more references
github.com ↗
5 Aug 2024, 02:32 UTC
Affected versionsThe structured affected or fixed version information changed.
Before
n/a · Fixed: No fixed version is explicitly recorded in the structured CVE data.
After
n/a · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
CNA ↗
5 Aug 2024, 02:32 UTC
Remediation statusRemediation status changed from Awaiting fix to Patch available.
Before
Awaiting fix
After
Patch available
github.com ↗
5 Aug 2024, 02:32 UTC
Public exploit evidencePublic exploit evidence changed from No public exploit to Public exploit reference.
Before
No public exploit
After
Public exploit reference
openldap.org ↗
5 Aug 2024, 02:32 UTC
SeveritySeverity changed from Unknown to High.
Before
Unknown
After
High
NIST NVD ↗
5 Aug 2024, 02:32 UTC
CVSS scoreCVSS score changed from not recorded to 7.5 (CVSS 3.1 · NIST NVD · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Before
not recorded
After
7.5 (CVSS 3.1 · NIST NVD · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
NIST NVD ↗
5 Aug 2024, 02:32 UTC
Catalogue recordCVE added to the BlackTree catalogue.
CNA ↗

2019-12-19CVE published

2024-08-05Fixed release or patch reference recorded

ENISA EUVD · EUVD-2019-9498↗CVE authority or vendor reference↗Patch or update reference↗Patch or update reference↗Public exploit reference↗Official CVE record (CNA and ADP data)↗NVD record↗

Technical terms and abbreviations used in this report

CVE: Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS: Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS: Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE: Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA: CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP: Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD: National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT: A computer security incident response team that publishes warnings or coordinates incident response.
PoC: Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF: Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL: Living off the land: abuse of legitimate tools or system functions during an attack.

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 severity in operational context

Evidence used

Compensating controls

Verification

Release-specific package status

National CERT insights
?
CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

ENISA European Vulnerability Database

EUVD-2019-9498

What, why and how

Exploit reality and attack path

Official authority intelligence

Patch and workaround

Evidence and provenance

What changed after publication