CVE-2025-27817: high-severity vulnerability in Apache Kafka Client
Apache Kafka Client: Arbitrary file read and SSRF vulnerability
Published
90Vexday Risk Score
Patch now. It exploitation observed by VulnCheck and has a working public exploit.
ssvc Actcvss 7.5epss 69%
from disclosure to weapon2 days
Published on NVDJun 10
1st PoC+2d
VulnCheck+302d
exploitation probability
69%top 1% of all CVEs
observed exploitation
yesVulnCheck
2 public exploit(s)
What the vendors declare (VEX)
Official vendor statements in CSAF/VEX format: whether their product is affected, already fixed, or ruled out — and why. These are the vendor's assertions, not Vexday's judgment.
Red HatVEX document ↗
Fixed
Not affected
21 products (380 components) — because the vulnerable code is not present in the product
streams for Apache Kafka 2 · Red Hat JBoss Enterprise Application Platform 8 · Red Hat JBoss Enterprise Application Platform Expansion Pack · streams for Apache Kafka · Red Hat JBoss Enterprise Application Platform 7 · and others 16
A possible arbitrary file read and SSRF vulnerability has been identified in Apache Kafka Client. Apache Kafka Clients accept configuration data for setting the SASL/OAUTHBEARER connection with the brokers, including "sasl.oauthbearer.token.endpoint.url" and "sasl.oauthbearer.jwks.endpoint.url". Apache Kafka allows clients to read an arbitrary file and return the content in the error log, or sending requests to an unintended location. In applications where Apache Kafka Clients configurations can be specified by an untrusted party, attackers may use the "sasl.oauthbearer.token.endpoint.url" and "sasl.oauthbearer.jwks.endpoint.url" configuratin to read arbitrary contents of the disk and environment variables or make requests to an unintended location. In particular, this flaw may be used in Apache Kafka Connect to escalate from REST API access to filesystem/environment/URL access, which may be undesirable in certain environments, including SaaS products.
Since Apache Kafka 3.9.1/4.0.0, we have added a system property ("-Dorg.apache.kafka.sasl.oauthbearer.allowed.urls") to set the allowed urls in SASL JAAS configuration. In 3.9.1, it accepts all urls by default for backward compatibility. However in 4.0.0 and newer, the default value is empty list and users have to set the allowed urls explicitly.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected products
Apache Software Foundation · Apache Kafka Clientpublic PoCs found — 2
vulncheckvulncheck.com/xdb/de794ec39752unverifiedvulncheckvulncheck.com/xdb/0df121059699unverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.