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No exploitation reportedFix available

CVE-2020-25692

No exploitation reported by the sources we read.

  • Published2020-12-08
  • Fixed in2.4.55
  • WeaknessCWE-476

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2020-12-0801:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-25692?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-25692?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Openldap
BranchAffectedFixed in
2.4< 2.4.552.4.55
Redhat enterprise linux
BranchAffectedFixed in
5.0= 5.0no fix published
6.0= 6.0no fix published
7.0= 7.0no fix published
Netapp cloud backup
BranchAffectedFixed in
—all versionsno fix published

1 more product in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • ICSA-23-059-01 CISA8 known affected

    Hitachi Energy Gateway Station

    Gateway Station (GWS): 2.0.0.0 · Gateway Station (GWS): 2.1.0.0 · Gateway Station (GWS): 2.2.0.0 · +5 more

  • ICSA-22-272-02 CISA2 known affected

    Hitachi Energy MicroSCADA Pro X SYS600

    SYS600: 9.x versions · SYS600: 10.3.1 and earlier

Full record on NVD

Fix

  1. Update Openldap to 2.4.55
  2. Vendor fix CISA ICSA-23-059-01 · 8 productsHitachi Energy has created an update to address the reported vulnerabilities and recommends users update to at least GWS version 3.3.0.0
  3. Vendor fix CISA ICSA-23-059-01 · 8 productsFor CVE-2020-25692, the vulnerability impacts GWS if the authentication service is installed. It is not installed by default but is required during the installation process of GWS or installed manually later. Authentication Service (previously ABB Authentication Service) is only needed when GWS use…
  4. Vendor fix CISA ICSA-23-059-01 · 8 productsHitachi Energy recommends the following general mitigation factors and security practices:
  5. Vendor fix CISA ICSA-23-059-01 · 8 productsConfigure firewalls to protect process control networks from attacks originating from outside the network
  6. Vendor fix CISA ICSA-23-059-01 · 8 productsPhysically protect process control systems from direct access by unauthorized personnel
  7. Vendor fix CISA ICSA-23-059-01 · 8 productsAvoid directly connecting control systems to the internet

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVSS 3.17.5read 2026-10-23
  • NVDCVSS 2.05read 2026-10-23
  • CNAweakness (CWE)CWE-476read 2026-10-23
  • FIRST EPSSEPSS score3.2 %2026-10-23
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2020-12-08
Last Modified
2026-10-14
NVD status
Modified

Frequently asked questions

What is CVE-2020-25692?

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.

Is CVE-2020-25692 actively exploited?

Active exploitation of CVE-2020-25692 has not been confirmed. Its EPSS score was 3.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-25692?

CVE-2020-25692 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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