CVE-2021-29262
Misapplied Zookeeper ACLs can result in leakage of configured authentication and authorization settings
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2021-29262- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:P/I:N/A:N - Weakness
- CWE-522
- Updated
- 2026-11-02
CVE List No score
Misapplied Zookeeper ACLs can result in leakage of configured authentication and authorization settings
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.
- Record
CVE-2021-29262- Weakness
- CWE-522
- Updated
- 2026-11-02
EUVDEUVD-2021-1115 No score
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.
- Record
EUVD-2021-1115- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-jgcr-fg3g-qvw8
Improper permission handling in Apache Solr
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.
- Record
GHSA-jgcr-fg3g-qvw8- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-279, CWE-522
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2021-29262- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
OSVGHSA-jgcr-fg3g-qvw8
Improper permission handling in Apache Solr
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.
- Record
GHSA-jgcr-fg3g-qvw8- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-279, CWE-522
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2021-29262
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.
- Record
UBUNTU-CVE-2021-29262- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
OSVBIT-solr-2021-29262 No score
Misapplied Zookeeper ACLs can result in leakage of configured authentication and authorization settings
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.
- Record
BIT-solr-2021-29262- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
org.apache.solr:solr-coreMaven |
before 8.8.2 | 8.8.2 |
solrBitnami |
before 8.8.2 | 8.8.2 |
org.apache.solr:solr-coreMaven |
before 8.8.2, plus listed versions 1.3.01.4.01.4.13.1.03.2.0 Show 45 moreShow less3.3.03.4.03.5.03.6.03.6.13.6.24.0.04.0.0-ALPHA4.0.0-BETA4.1.04.10.04.10.14.10.24.10.34.10.44.2.04.2.14.3.04.3.14.4.04.5.04.5.14.6.04.6.14.7.04.7.14.7.24.8.04.8.14.9.04.9.15.0.05.1.05.2.05.2.15.3.05.3.15.3.25.4.05.4.15.5.05.5.15.5.25.5.35.5.4 |
8.8.2 |
lucene-solrUbuntu:Pro:14.04:LTS |
All versions, plus listed versions 3.6.2+dfsg-13.6.2+dfsg-23.6.2+dfsg-2ubuntu0.1~esm13.6.2+dfsg-2ubuntu0.1~esm23.6.2+dfsg-2ubuntu0.1~esm4 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-29262 is a high vulnerability (CVSS 7.5) in Apache Solr, published April 13, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 6.72%, the 93rd percentile. Fixed in org.apache.solr:solr-core 8.8.2.
References
lists.apache.org/thread.html/r536da4c4e4e406f7843461cc754a3d0a3fe575aa576e2b71a9cd57d0%40%3Cannounce.apache.org%3E
security.netapp.com/advisory/ntap-20210604-0009
Show 21 moreShow less
nvd.nist.gov/vuln/detail/CVE-2021-29262
issues.apache.org/jira/browse/SOLR-15249
github.com/advisories/GHSA-jgcr-fg3g-qvw8
ubuntu.com/security/CVE-2021-29262
cve.org/CVERecord?id=CVE-2021-29262
Left out here: 51 versions. The JSON record has them.