CVE-2020-5281Network attack vector

Directory disclosure via unescaped LDAP search input

Published Mar 25, 2020 · Updated Aug 4, 2024

LDAP injection in CESNET Perun before 3.9.1 allows remote authenticated users to retrieve all entries from the Perun LDAP directory. ExtSourceLdap.findSubjectsLogins and getSubjectByLogin inserted external search values directly into LDAP filter templates without escaping metacharacters. VO or group-manager privileges and a configured LDAP extSource are required; successful queries disclose directory entries.

CVSS severity6.2
Medium
EPSS probability1.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

LDAP injection in CESNET Perun before 3.9.1 allows remote authenticated users to retrieve all entries from the Perun LDAP directory. ExtSourceLdap.findSubjectsLogins and getSubjectByLogin inserted external search values directly into LDAP filter templates without escaping metacharacters. VO or group-manager privileges and a configured LDAP extSource are required; successful queries disclose directory entries.

The record

CVE
CVE-2020-5281
Published
Mar 25, 2020
Updated
Aug 4, 2024
Vendor
CESNET
Product
Perun
Classifications
CWE-732, CWE-90, T1087.002
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 25, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

CESNET · Perunversion=< 3.9.1

Published CVSS scores

6.2GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:L/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-732Incorrect Permission Assignment for Critical Resource
CWE-90Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')
T1087.002Domain Account

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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