Critical
lucene-solr — security advisory
The ReplicationHandler (normally registered at "/replication" under a Solr core) in Apache Solr has a "masterUrl" (also "leaderUrl" alias) parameter that is used to designate another ReplicationHandler on another Solr core to replicate index data into the local core. To prevent a SSRF vulnerability, Solr ought to check these parameters against a similar configuration it uses for the "shards" parameter. Prior to this bug getting fixed, it did not. This problem affects essentially all Solr versions prior to it getting fixed in 8.8.2.
- Products
- lucene-solr
- Affected versions
- 3.6.2+dfsg-1, 3.6.2+dfsg-10, 3.6.2+dfsg-11, 3.6.2+dfsg-18~18.04, 3.6.2+dfsg-18~18.04.1~esm2, 3.6.2+dfsg-2, 3.6.2+dfsg-20, 3.6.2+dfsg-22, 3.6.2+dfsg-24, 3.6.2+dfsg-26, 3.6.2+dfsg-27, 3.6.2+dfsg-2ubuntu0.1~esm1, 3.6.2+dfsg-2ubuntu0.1~esm2, 3.6.2+dfsg-2ubuntu0.1~esm4, 3.6.2+dfsg-7, 3.6.2+dfsg-8, 3.6.2+dfsg-8ubuntu0.1, 3.6.2+dfsg-8ubuntu0.1+esm1
- Fixed versions
- Not specified
- CVEs
- CVE-2021-27905
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:36 UTC · Revision 1
Source evidence
The ReplicationHandler (normally registered at "/replication" under a Solr core) in Apache Solr has a "masterUrl" (also "leaderUrl" alias) parameter that is used to designate another ReplicationHandler on another Solr core to replicate index data into the local core. To prevent a SSRF vulnerability, Solr ought to check these parameters against a similar configuration it uses for the "shards" parameter. Prior to this bug getting fixed, it did not. This problem affects essentially all Solr versions prior to it getting fixed in 8.8.2.
osv:UBUNTU-CVE-2021-27905
lucene-solr
Fixed versions: Not specified
lucene-solr
Fixed versions: Not specified
lucene-solr
Fixed versions: Not specified
lucene-solr
Fixed versions: Not specified
lucene-solr
Fixed versions: Not specified
lucene-solr
Fixed versions: Not specified
lucene-solr
Fixed versions: Not specified
lucene-solr
Fixed versions: Not specified
lucene-solr
Fixed versions: Not specified
Complete source record
{
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],
"modified": "2026-10-17T12:57:12.539803951Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://ubuntu.com/security/CVE-2021-27905",
"https://lists.apache.org/thread.html/r0ddc3a82bd7523b1453cb7a5e09eb5559517145425074a42eb326b10%40%3Cannounce.apache.org%3E",
"https://www.cve.org/CVERecord?id=CVE-2021-27905"
]
},
"related_cves": [
{
"value": "CVE-2021-27905",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 356907,
"published_at": "2021-04-13T07:15:00+00:00"
}