---
title: "CVE-2021-27905: SSRF vulnerability with the Replication… | CubePath"
description: "The ReplicationHandler (normally registered at \"/replication\" under a Solr core) in Apache Solr has a \"masterUrl\" (also \"leaderUrl\" alias) parameter…"
language: en
source: https://cubepath.com/security/cve/CVE-2021-27905
---

# CVE-2021-27905: SSRF vulnerability with the Replication… | CubePath

## Description

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.

Official description from the CVE record, published by apache. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-27905)

## Key data

### EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score

0.93053 (93.1% probability)

Percentile

99.8%

Scores of

Nov 10, 2026

Model

v2026.06.15

### Weakness (CWE)

CWE catalog version 5.0.

CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license.

- [CWE-918](https://cwe.mitre.org/data/definitions/918.html) Server-Side Request Forgery

## Affected products

Products listed in the CVE record, as the CNA published them.

- Apache Solr

  - affected: Apache Solr up to before 8.8.2

## References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

- [lists.apache.org/thread.html/r0ddc3a82bd7523b1453cb7a5e09eb…](https://lists.apache.org/thread.html/r0ddc3a82bd7523b1453cb7a5e09eb5559517145425074a42eb326b10%40%3Cannounce.apache.org%3E)
- [security.netapp.com/advisory/ntap-20210611-0009](https://security.netapp.com/advisory/ntap-20210611-0009/)
- [\[solr-users\] 20210618 CVE-2021-27905 Apache Solr ReplicationHandler/SSRF vulnerability](https://lists.apache.org/thread.html/r95df34bb158375948da82b4dfe9a1b5d528572d586584162f8f5aeef%40%3Cusers.solr.apache.org%3E)  (lists.apache.org) mailing-list
- [\[solr-users\] 20210618 Re: CVE-2021-27905 Apache Solr ReplicationHandler/SSRF vulnerability](https://lists.apache.org/thread.html/r140128dc6bb4f4e0b6a39e962c7ca25a8cbc8e48ed766176c931fccc%40%3Cusers.solr.apache.org%3E)  (lists.apache.org) mailing-list
- [\[solr-users\] 20210728 Re: CVE-2021-27905 Apache Solr ReplicationHandler/SSRF vulnerability](https://lists.apache.org/thread.html/r3da74965aba2b5f5744b7289ad447306eeb2940c872801819faa9314%40%3Cusers.solr.apache.org%3E)  (lists.apache.org) mailing-list
- [\[ofbiz-notifications\] 20210914 \[jira\] \[Updated\] (OFBIZ-12316) The Solr version included in OFBiz has an SSRF vulnerability (CVE-2021-27905)](https://lists.apache.org/thread.html/rae9ccaecce9859f709ed1458545d90a4c07163070dc98b5e9e59057f%40%3Cnotifications.ofbiz.apache.org%3E)  (lists.apache.org) mailing-list
- [\[ofbiz-commits\] 20210915 \[ofbiz-plugins\] branch release18.12 updated: Fixed: The Solr version included in OFBiz has an SSRF vulnerability (CVE-2021-27905) (OFBIZ-12316)](https://lists.apache.org/thread.html/r720a4a0497fc90bad5feec8aa18b777912ee15c7eeb5f882adbf523e%40%3Ccommits.ofbiz.apache.org%3E)  (lists.apache.org) mailing-list
- [\[ofbiz-notifications\] 20210915 \[jira\] \[Commented\] (OFBIZ-12316) The Solr version included in OFBiz has an SSRF vulnerability (CVE-2021-27905)](https://lists.apache.org/thread.html/re9d64bb8e5dfefddcbf255adb4559e13a0df5b818da1b9b51329723f%40%3Cnotifications.ofbiz.apache.org%3E)  (lists.apache.org) mailing-list
- [\[ofbiz-notifications\] 20210915 \[jira\] \[Closed\] (OFBIZ-12316) The Solr version included in OFBiz has an SSRF vulnerability (CVE-2021-27905)](https://lists.apache.org/thread.html/rd232d77c57a8ce172359ab098df9512d8b37373ab87c444be911b430%40%3Cnotifications.ofbiz.apache.org%3E)  (lists.apache.org) mailing-list
- [\[ofbiz-commits\] 20210915 \[ofbiz-plugins\] branch trunk updated: Fixed: The Solr version included in OFBiz has an SSRF vulnerability (CVE-2021-27905) (OFBIZ-12316)](https://lists.apache.org/thread.html/r78a3a4f1138a1608b0c6d4a2ee7647848c1a20b0d5c652cd9b02c25a%40%3Ccommits.ofbiz.apache.org%3E)  (lists.apache.org) mailing-list
- [\[ofbiz-commits\] 20210915 \[ofbiz-plugins\] branch release17.12 updated: Fixed: The Solr version included in OFBiz has an SSRF vulnerability (CVE-2021-27905) (OFBIZ-12316)](https://lists.apache.org/thread.html/r6ccec7fc54d82591b23c143f1f6a6e38f6e03e75db70870e4cb14a1a%40%3Ccommits.ofbiz.apache.org%3E)  (lists.apache.org) mailing-list
- [\[ofbiz-notifications\] 20210915 \[jira\] \[Updated\] (OFBIZ-12316) The Solr version included in OFBiz has an SSRF vulnerability (CVE-2021-27905)](https://lists.apache.org/thread.html/r8f1152a43c36d878bbeb5a92f261e9efaf3af313b033d7acfccea59d%40%3Cnotifications.ofbiz.apache.org%3E)  (lists.apache.org) mailing-list

## Timeline

1. ID reserved Mar 2, 2021
2. Record published Apr 13, 2021
3. Record last updated Aug 3, 2024

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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 20:05 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)