CVE-2020-25710

A flaw was found in OpenLDAP in versions before 2.4.56. This flaw allows an attacker who sends a malicious packet processed by OpenLDAP to force a failed assertion in csnNormalize23(). The highest threat from this vulnerability is to system availability.

Published: 2021-05-28 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-25710 is rated High Risk (65.2/100): CVSS High severity, with high exploitation likelihood (EPSS 17.46%, 95th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +1.97% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-25710

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-12 15.50% 17.46% +1.97%
2 2026-02-28 17.46% 15.50% -1.97%
3 2026-02-01 — 17.46% —

Full EPSS history (30 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-25710

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2020-25710

OS Trackers for CVE-2020-25710

vendor priority summary link
alpine high CVE-2020-25710: 1 source package rows (openldap); 31 state rows across 10 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 11, open 20. https://security.alpinelinux.org/vuln/CVE-2020-25710
debian not yet assigned CVE-2020-25710 not yet assigned priority: Debian including 1 source packages (openldap), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2020-25710
redhat medium — https://access.redhat.com/security/cve/CVE-2020-25710
suse medium CVE-2020-25710 severity moderate: SUSE including 232 source package names (0.1.0:libldap-2_4-2-2.4.46-9.45.1, 0.1.0:libldap-data-2.4.46-9.45.1, …), 334 product×package rows across 116 product lines (Container bci/dotnet-aspnet, Container bci/dotnet-runtime, … (116 product lines)): Fixed 334. https://www.suse.com/security/cve/CVE-2020-25710/
ubuntu medium CVE-2020-25710 medium priority: Ubuntu including 1 source packages (openldap), 6 status rows across 6 suites (bionic, focal, groovy, trusty, upstream, xenial): released 6. https://ubuntu.com/security/CVE-2020-25710

Affected software / configurations for CVE-2020-25710

Vendor Product Version Raw CPE
openldap openldap < 2.4.56 cpe:2.3:a:openldap:openldap:*:*:*:*:*:*:*:*
redhat jboss_core_services — cpe:2.3:a:redhat:jboss_core_services:-:*:*:*:*:*:*:*
redhat jboss_enterprise_application_platform 5.0.0 cpe:2.3:a:redhat:jboss_enterprise_application_platform:5.0.0:*:*:*:*:*:*:*
redhat jboss_enterprise_web_server 2.0.0 cpe:2.3:a:redhat:jboss_enterprise_web_server:2.0.0:*:*:*:*:*:*:*
redhat enterprise_linux 5.0 cpe:2.3:o:redhat:enterprise_linux:5.0:*:*:*:*:*:*:*
redhat enterprise_linux 6.0 cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
redhat enterprise_linux 7.0 cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
fedoraproject fedora 33 cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*

References for CVE-2020-25710

cvelogic Threat Intelligence