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Fencer Vulns
high 7.5

CVE-2021-29262 json

Misapplied Zookeeper ACLs can result in leakage of configured authentication and authorization settings

published 2021-04-13 5 y ago modified 2026-09-08 2 mo ago also BIT-solr-2021-29262 , EUVD-2021-1115 , GHSA-jgcr-fg3g-qvw8

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.7%
EPSS 6.7% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

When starting Apache Solr versions prior to 8.8.2, configured with the SaslZkACLProvider or VMParamsAllAndReadonlyDigestZkACLProvider and no existing security.json znode, if the optional read-only user is configured then Solr would not treat that node as a sensitive path and would allow it to be readable. Additionally, with any ZkACLProvider, if the security.json is already present, Solr will not automatically update the ACLs.

Patch / fix

  • maven org.apache.solr:solr-core 8.8.2
  • bitnami solr 8.8.2
  • Apache Software Foundation Apache Solr 8.8.2
  • solr Arch Linux 8.8.2-1

arch linux advisories AVG-1808

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-29262 updated cvss 5.9

solr: misapplied Zookeeper ACLs can result in leakage of configured authentication and authorization settings

  • Red Hat JBoss Data Virtualization 6 solr solr Red Hat JBoss Enterprise Application Platform 6 solr solr Red Hat JBoss Fuse 6 solr solr Red Hat JBoss Fuse Service Works 6 solr solr
    affected: no fix planned “Out of support scope”
  • Red Hat Fuse 7 solr solr Red Hat Integration Camel K 1 camel-solr camel-solr Red Hat JBoss Web Server 3 solr solr
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

6.72% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
maven org.apache.solr:solr-core
<8.8.2
8.8.2
bitnami solr
<8.8.2
8.8.2

Affected products

  • Apache Software Foundation Apache Solr

Classification

Weakness
  • CWE-522 Insufficiently Protected Credentials
  • CWE-279 Incorrect Execution-Assigned Permissions

References

Sources

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.