LDAP connector injection in Perun

published 2020-03-25 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-26477

cvss: 6.2; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.4%; EPSS 1.4% chance of exploitation in 30 days, percentile 71%
public exploits: 0; none known

In Perun before version 3.9.1, VO or group manager can modify configuration of the LDAP extSource to retrieve all from Perun LDAP. Issue is fixed in version 3.9.1 by sanitisation of the input.

Patch / fix

fixed in 1 links 2

cesnet perun 3.9.1

github.com/CESNET/perun@ac527bc commit
github.com/CESNET/perun#2635 pull request

Exploit prediction

1.36% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.2	CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:L/A:N
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

CESNET perun

Classification

Weakness

CWE-90 Improper Neutralization of Special Elements used in an LDAP Query
CWE-732 Incorrect Permission Assignment for Critical Resource

References

github.com /CESNET/perun/pull/2635
patch, third-party-advisory
github.com /CESNET/perun/commit/ac527bc3225a64208ee5cee59e5918ee360ca039
patch, third-party-advisory
github.com /CESNET/perun/security/advisories/GHSA-gj88-9q3f-72m3
third-party-advisory

Sources

CVE List CVE-2020-5281
NVD CVE-2020-5281

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary