Server-Side Request Forgery in Apache Solr
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | org.apache.solr:solr-parent | < 8.8.2 | 8.8.2 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2021-27905
- https://lists.apache.org/thread.html/r0ddc3a82bd7523b1453cb7a5e09eb5559517145425074a42eb326b10%40%3Cannounce.apache.org%3E
- https://lists.apache.org/thread.html/r140128dc6bb4f4e0b6a39e962c7ca25a8cbc8e48ed766176c931fccc@%3Cusers.solr.apache.org%3E
- https://lists.apache.org/thread.html/r3da74965aba2b5f5744b7289ad447306eeb2940c872801819faa9314@%3Cusers.solr.apache.org%3E
- https://lists.apache.org/thread.html/r6ccec7fc54d82591b23c143f1f6a6e38f6e03e75db70870e4cb14a1a@%3Ccommits.ofbiz.apache.org%3E
- https://lists.apache.org/thread.html/r720a4a0497fc90bad5feec8aa18b777912ee15c7eeb5f882adbf523e@%3Ccommits.ofbiz.apache.org%3E
- https://lists.apache.org/thread.html/r78a3a4f1138a1608b0c6d4a2ee7647848c1a20b0d5c652cd9b02c25a@%3Ccommits.ofbiz.apache.org%3E
- https://lists.apache.org/thread.html/r8f1152a43c36d878bbeb5a92f261e9efaf3af313b033d7acfccea59d@%3Cnotifications.ofbiz.apache.org%3E
- https://lists.apache.org/thread.html/r95df34bb158375948da82b4dfe9a1b5d528572d586584162f8f5aeef@%3Cusers.solr.apache.org%3E
- https://lists.apache.org/thread.html/rae9ccaecce9859f709ed1458545d90a4c07163070dc98b5e9e59057f@%3Cnotifications.ofbiz.apache.org%3E
- https://lists.apache.org/thread.html/rd232d77c57a8ce172359ab098df9512d8b37373ab87c444be911b430@%3Cnotifications.ofbiz.apache.org%3E
- https://lists.apache.org/thread.html/re9d64bb8e5dfefddcbf255adb4559e13a0df5b818da1b9b51329723f@%3Cnotifications.ofbiz.apache.org%3E
- https://security.netapp.com/advisory/ntap-20210611-0009
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N- Weakness (CWE)
CWE-918- Platform
- Java / Kotlin (Maven)
- Package
org.apache.solr:solr-parent- Disclosed
- 10.05.2021
- Updated
- 11.10.2026 11:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-5phw-3jrp-3vj8 - CC BY 4.0
Vulnerability history: org.apache.solr:solr-parent
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 6
- First → latest
- 05.2021 02.2022
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 3
- High 1
- Medium 2
Disclosures per year
- 2021: 2
- 2022: 4
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 0
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Server-Side Request Forgery in Apache Solr this entry
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