CVE-2021-27905
high-risk
Published 2021-04-13
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.
Do I need to act?
!
93.9% chance of exploitation in next 30 days
EPSS score — higher than 6% of all CVEs
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10
Critical
NETWORK
/ LOW complexity
Affected Products (1)
Affected Vendors
References (24)
Third Party Advisory
https://security.netapp.com/advisory/ntap-20210611-0009/
and 4 more references
57
/ 100
high-risk
Severity
32/34 · Critical
Exploitability
20/34 · Moderate
Exposure
5/34 · Minimal