CVE-2020-25710: debian debian_linux Reachable Assertion
CVSS: 7.5v3.1HighModified
AliasesALPINE-CVE-2020-25710UBUNTU-CVE-2020-25710DEBIAN-CVE-2020-25710
Published 28-05-2021Last modified 14-10-2026
Vulnerability summary
CVE-2020-25710 is a high (CVSS 7.5) Reachable Assertion vulnerability in debian debian_linux. EPSS estimates a 2.73% chance of exploitation in the next 30 days, higher than 85.8% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
2.73%
0%100%
Low · +0.06 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 12 · Related 8Timeline
- 28-05-2021PublishedVulnerability first disclosed.
- 14-10-2026Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
5 scores · 4 sources · 2 versionsHigh 7.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 4 agree
- OSV · AlpineEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
2.73%
Chance of exploitation in the next 30 days
Percentile
86%
Versus all other CVEs
30-day change
+0.06 pp
From 2.67% on 19-09-2026
19-09-202619-10-2026
EPSS score2.73%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Redhat4 products
- enterprise_linuxEOL5.0 | 6.0 | 7.0
- jboss_core_servicesna
- jboss_enterprise_application_platform5.0.0
- jboss_enterprise_web_server2.0.0
Debian2 products
- openldap< 2.4.56+dfsg-1
- debian_linuxEOL9.0
Alpine1 product
- openldap< 2.4.48-r2 | < 2.4.48-r3 | < 2.4.50-r1 | < 2.4.56-r0
Fedoraproject1 product
- fedoraEOL33
Openldap1 product
- openldap< 2.4.56
Ubuntu1 product
- openldap< 2.4.31-1+nmu2ubuntu8.5+esm4 | < 2.4.42+dfsg-2ubuntu3.11 | < 2.4.45+dfsg-1ubuntu1.8 | < 2.4.49+dfsg-2ubuntu1.5
6 vendors · 10 products
References
14 links
- lists.debian.org/debian-lts-announce/2020/12/msg00008.htmlMailing ListX Refsource MLISTThird Party Advisory
- git.openldap.org/openldap/openldap/-/commit/ab3915154e69920d480205b4bf5ccb2b391a0a1fX Refsource MISCPatchVendor Advisory