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CVE-2019-13565: An issue was discovered in OpenLDAP 2.x before 2.4.48

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HIGH 7.5REMOTEWATCHLISTUPGRADEMITIGATEMITIGATE

CVE-2019-13565 is a high-severity flaw (CVSS 7.5) affecting openldap, ubuntu linux, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in OpenLDAP 2.x before 2.4.48. When using SASL authentication and session encryption, and relying on the SASL security layers in slapd access controls, it is possible to obtain access that would otherwise be denied via a simple bind for any identity covered in those ACLs. After the first SASL bind is completed, the sasl_ssf value is retained for all new non-SASL connections. Depending on the ACL configuration, this can aff

Why this priority

  • High severity
  • EPSS top 8%: very likely to be exploited
  • Remotely exploitable, no login, no user action
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score7.5 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance5.0% (top 8%)
CISA exploited listNo
Published2019-07-26
Last modified2026-10-14
Publisher (CNA): MITRE · Vendor: apple · canonical · debian · f5 · openldap · opensuse

Share: LinkedIn · X · Reddit

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

openldap openldap UPGRADE
Affected: >= 2.0 and <= 2.4.47
Fixed in: newer than 2.4.47
Safe to downgrade to: a release before 2.0
1. Check installed version
apt-cache policy openldap || rpm -q openldap || openldap --version
2. UPGRADE to newer than 2.4.47 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade openldap
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade openldap
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 2.0 (Debian / Ubuntu)
apt-cache madison openldap sudo apt install openldap=<VERSION_BEFORE_2.0> sudo apt-mark hold openldap
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list openldap sudo dnf downgrade openldap-<VERSION_BEFORE_2.0> sudo dnf versionlock add openldap
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
canonical ubuntu linux MITIGATE
Affected: 12.04 · 14.04 · 16.04 · 18.04 · 19.04
Fixed in: no fixed release known
Safe to downgrade to: a release before 12.04
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
debian debian linux MITIGATE
Affected: 8.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 8.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
opensuse leap MITIGATE
Affected: 15.0 · 15.1
Fixed in: no fixed release known
Safe to downgrade to: a release before 15.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
f5 traffix signaling delivery controller DOWNGRADE
Affected: 5.0.0 · 5.1.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 5.0.0
1. Check installed version
apt-cache policy traffix-signaling-delivery-controller || rpm -q traffix-signaling-delivery-controller || traffix-signaling-delivery-controller --version
2. No fixed release: DOWNGRADE to a release before 5.0.0 (Debian / Ubuntu)
apt-cache madison traffix-signaling-delivery-controller sudo apt install traffix-signaling-delivery-controller=<VERSION_BEFORE_5.0.0> sudo apt-mark hold traffix-signaling-delivery-controller
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list traffix-signaling-delivery-controller sudo dnf downgrade traffix-signaling-delivery-controller-<VERSION_BEFORE_5.0.0> sudo dnf versionlock add traffix-signaling-delivery-controller
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
apple mac os x UPGRADE
Affected: >= 10.13 and < 10.13.6 · >= 10.14 and < 10.14.6 · >= 10.15 and < 10.15.2 · 10.13.6 · 10.13.6 security_update_2018-002 · 10.13.6 security_update_2018-003 · 10.13.6 security_update_2019-001 · 10.13.6 security_update_2019-002
Fixed in: 10.13.6, 10.14.6, 10.15.2
Safe to downgrade to: a release before 10.13
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-13565?

openldap: upgrade to newer than 2.4.47; ubuntu linux: mitigate or apply the listed mitigation; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-13565 being exploited?

CVE-2019-13565 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-13565 affect?

CVE-2019-13565 affects openldap, ubuntu linux, debian linux. Severity is high (CVSS 7.5). An issue was discovered in OpenLDAP 2.x before 2.4.48. When using SASL authentication and session encryption, and relying on the SASL security layers in slapd access controls, it is possible to obtain access that would otherwise be denied v

How urgent is CVE-2019-13565?

Priority 59/100. High severity; EPSS top 8%: very likely to be exploited; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Ubuntu vulnerabilities · Debian vulnerabilities · F5 BIG-IP vulnerabilities · OpenLDAP vulnerabilities

Related CVEs

References

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