SSRF in Apache Solr

CVE-2021-27905

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 ind…

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.931 (99.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2021-27905?
CVE-2021-27905 is a critical-severity vulnerability in Apache Solr, classified under Server-Side Request Forgery (SSRF). CVSS score: 9.8/10. Published 2021-04-13.
How severe is CVE-2021-27905?
Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-27905 known to be exploited?
40 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.