CVE-2020-25692: A NULL pointer dereference was found in OpenLDAP server and was fixed in openldap 2.4.55, during a request for

Q: How do I fix CVE-2020-25692?

openldap: upgrade to 2.4.55; enterprise linux: mitigate or apply the listed mitigation; cloud backup: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2020-25692 being exploited?

CVE-2020-25692 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-25692 affect?

CVE-2020-25692 affects openldap, enterprise linux, cloud backup. Severity is high (CVSS 7.5). A NULL pointer dereference was found in OpenLDAP server and was fixed in openldap 2.4.55, during a request for renaming RDNs. An unauthenticated attacker could remotely crash the slapd process by sending a specially crafted request, causing

Q: How urgent is CVE-2020-25692?

Priority 58/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

This month

HIGH 7.5REMOTEWATCHLISTUPGRADEMITIGATEMITIGATE

CVE-2020-25692 is a high-severity flaw (CVSS 7.5) affecting openldap, enterprise linux, cloud backup. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A NULL pointer dereference was found in OpenLDAP server and was fixed in openldap 2.4.55, during a request for renaming RDNs. An unauthenticated attacker could remotely crash the slapd process by sending a specially crafted request, causing a Denial of Service.

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.1% (top 12%)
CISA exploited list	No
Weakness	CWE-476
Published	2020-12-08
Last modified	2026-10-14

Publisher (CNA): Red Hat, Inc. · Vendor: netapp · openldap · redhat

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

Am I affected?

Timeline

2020-12-08 01:15 UTCPublished CVE record published
2026-10-14 10:17 UTCUpdated Record last modified

openldap openldap UPGRADE

Affected: < 2.4.55

Fixed in: 2.4.55

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy openldap || rpm -q openldap || openldap --version

2. UPGRADE to 2.4.55 (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.

redhat enterprise linux MITIGATE

Affected: 5.0 · 6.0 · 7.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0

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.

netapp cloud backup MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy cloud-backup || rpm -q cloud-backup || cloud-backup --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

netapp solidfire baseboard management controller firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

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-2020-25692?

openldap: upgrade to 2.4.55; enterprise linux: mitigate or apply the listed mitigation; cloud backup: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-25692 being exploited?

CVE-2020-25692 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-2020-25692 affect?

CVE-2020-25692 affects openldap, enterprise linux, cloud backup. Severity is high (CVSS 7.5). A NULL pointer dereference was found in OpenLDAP server and was fixed in openldap 2.4.55, during a request for renaming RDNs. An unauthenticated attacker could remotely crash the slapd process by sending a specially crafted request, causing

How urgent is CVE-2020-25692?

Priority 58/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

OpenLDAP vulnerabilities

Related CVEs

CVE-2023-2953 HIGH 7.5 DOWNGRADE MITIGATE A vulnerability was found in openldap
CVE-2022-29155 CRITICAL 9.8 UPGRADE MITIGATE In OpenLDAP 2.x before 2.5.12 and 2.6.x before 2.6.2, a SQL injection vulnerability exists in the experimental
CVE-2021-27212 HIGH 7.5 UPGRADE MITIGATE In OpenLDAP through 2.4.57 and 2.5.x through 2.5.1alpha, an assertion failure in slapd can occur in the issuer
CVE-2020-36230 HIGH 7.5 UPGRADE MITIGATE A flaw was discovered in OpenLDAP before 2.4.57 leading in an assertion failure in slapd in the X.509 DN parsi
CVE-2020-36229 HIGH 7.5 UPGRADE MITIGATE A flaw was discovered in ldap_X509dn2bv in OpenLDAP before 2.4.57 leading to a slapd crash in the X.509 DN par

References

← Back to latest CVEs