Apache ZooKeeper: Information disclosure in persistent watcher handling
Information disclosure in persistent watchers handling in Apache ZooKeeper due to missing ACL check. It allows an attacker to monitor child znodes by attaching a persistent watcher (addWatch command) to a parent which the attacker has already access to. ZooKeeper server doesn't do ACL check when the persistent watcher is triggered and as a consequence, the full path of znodes that a watch event gets triggered upon is exposed to the owner of the watcher. It's important to note that only the path is exposed by this vulnerability, not the data of znode, but since znode path can contain sensitive information like user name or login ID, this issue is potentially critical. Users are recommended to upgrade to version 3.9.2, 3.8.4 which fixes the issue.
- Published
- Mar 15, 2024
- Updated
- Jun 17, 2026
- EPSS
- 0.2% · 15th percentile
- CWE
- CWE-862
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Report tools
Action score
21
Monitor
Low priority for now.
- CVSS
- 21 / 40 · 5.3 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| apache | zookeeper | cpe:2.3:a:apache:zookeeper |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- apache zookeeper3.6.0 and later · up to 3.7.2 inclusive
- apache zookeeper3.8.0 and later · before 3.8.4
- apache zookeeper3.9.0 and later · before 3.9.2
Versions reported by the vendor
Affected version ranges reported by the assigning authority (apache). Independent of NVD's CPE analysis and usually ahead of it.
Apache Software Foundation Apache ZooKeeper
- 3.9.0 and later · up to and including 3.9.1affected · maven
- 3.8.0 and later · up to and including 3.8.3affected · maven
- 3.6.0 and later · up to and including 3.7.2affected · maven
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | zookeeper | before 3.8.0-11+deb12u2 | 3.8.0-11+deb12u2 |
| Debian:13 | zookeeper | before 3.9.2-1 | 3.9.2-1 |
| Maven | org.apache.zookeeper:zookeeper | from 3.6.0 · up to and including 3.7.2 | — |
| Maven | org.apache.zookeeper:zookeeper | from 3.8.0 · before 3.8.4 | 3.8.4 |
| Maven | org.apache.zookeeper:zookeeper | from 3.9.0 · before 3.9.2 | 3.9.2 |
Same product
apache: all recordsOther highest-scoring records for the same primary product.
- CVE-2017-5637Two four letter word commands "wchp/wchc" are CPU intensive and could cause spike of CPU utilization on Apache ZooKeeper server if abused, w52Plan
- CVE-2023-44981Apache ZooKeeper: Authorization bypass in SASL Quorum Peer Authentication37Monitor
- CVE-2024-51504Apache ZooKeeper: Authentication bypass with IP-based authentication in Admin Server36Monitor
- CVE-2016-5017Buffer overflow in the C cli shell in Apache Zookeeper before 3.4.9 and 3.5.x before 3.5.3, when using the "cmd:" batch mode syntax, allows 34Monitor
- CVE-2018-8012No authentication/authorization is enforced when a server attempts to join a quorum in Apache ZooKeeper before 3.4.10, and 3.5.0-alpha throu33Monitor
- CVE-2026-79993Apache ZooKeeper: Missing ACL check on deleteContainer opcode allows unauthorized deletion of any empty persistent/container znode30Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Apache Software Foundation Apache ZooKeeper | 3.9.2 · description | Vendor (CNA) |
| debian:zookeeper | 3.8.0-11+deb12u2 · Debian:12 | Package registry (OSV) |
| Maven:org.apache.zookeeper:zookeeper | 3.8.4 | Package registry (OSV) |
| Maven:org.apache.zookeeper:zookeeper | 3.9.2 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-26-1115 · Sep 17, 2026(Apache NiFi/ZooKeeper Güvenlik Bildirimi)
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- low · data can be read
- Integrity
- low · data or configuration can be modified
- Availability
- low · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- Low
- Integrity impact
- Low
- Availability impact
- Low
Weakness class (CWE)
CWE-862 · Missing AuthorizationCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- lists.apache.org/thread/96s5nqssj03rznz9hv58txdb2k1lr79k
- www.openwall.com/lists/oss-security/2024/03/14/2
Vendor advisories and official records. Exploit/PoC links are deliberately left out.