CVE-2021-29943

Solr vulnerability

CVSS

9.1

EPSS

5.3%

EPSS pct

92th

Exploited

No known

When using ConfigurableInternodeAuthHadoopPlugin for authentication, Apache Solr versions prior to 8.8.2 would forward/proxy distributed requests using server credentials instead of original client credentials. This would result in incorrect authorization resolution on the receiving hosts.

Affected vendor

Apache

Affected product

Solr

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness type (CWE)

CWE-863 — Incorrect Authorization

Published

2021-04-13

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity.

Its EPSS score of 5.3% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 92% of all scored CVEs.

Check your external exposure to CVE-2021-29943

Confirm whether Apache Solr is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2021-29943.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-29943

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-29943 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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