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Fencer Vulns
critical 9.1

CVE-2021-29943 json

Apache Solr Unprivileged users may be able to perform unauthorized read/write to collections

published 2021-04-13 5 y ago modified 2026-09-08 2 mo ago also BIT-solr-2021-29943 , EUVD-2021-1201 , GHSA-vf7p-j8x6-xvwp

cvss
9.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.7%
EPSS 4.7% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

When using ConfigurableInternodeAuthHadoopPlugin for authentication, Apache Solr versions prior to 8.8.2 would forward/proxy distributed requests using server credentials instead of original client credentials. This would result in incorrect authorization resolution on the receiving hosts.

Patch / fix

  • maven org.apache.solr:solr-parent 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-2021-29943 updated cvss 9.1

solr: unprivileged users may be able to perform unauthorized read/write to collections

  • 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

4.67% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
GitHub 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:P/I:P/A:N
OSV 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected packages

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

Affected products

  • Apache Software Foundation Apache Solr

Classification

Weakness

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.