Security readout for executives and security teams
Plain-English summary
This issue can make an application’s OkHttp HTTP client consume excessive resources when Brotli response handling is enabled and it receives a malicious compressed response. The known impact is denial of service, not data theft or code execution. The supplied record does not show active exploitation or a named fixed version.
Executive priority
Treat as a targeted availability risk, not an emergency breach indicator. Prioritize internet-facing services, crawlers, integrations, and backend jobs that use OkHttp Brotli against untrusted destinations. Remediate through dependency review and vendor-guided updates or configuration changes.
Technical view
CVE-2023-3782 is a CWE-400 resource consumption issue in com.squareup.okhttp3:okhttp-brotli when BrotliInterceptor processes a crafted Brotli zip-bomb response from a malicious server or injected via MitM. CVSS is 5.9, network reachable, high attack complexity, availability impact high, with no confidentiality or integrity impact listed.
Likely exposure
Exposure is likely limited to Java/Kotlin applications using the OkHttp Brotli package and BrotliInterceptor for outbound HTTP. Risk is higher where clients request untrusted URLs, accept responses from attacker-controlled servers, or operate where MitM response injection is plausible. The supplied affected version data is incomplete, listing version "0" only.
Exploitation context
The source bundle supports a denial-of-service scenario through malicious Brotli-compressed HTTP responses. It does not indicate CISA KEV listing, confirmed active exploitation, public weaponization, or compromise of servers. Exploitation appears dependent on the vulnerable client receiving and processing a crafted response.
Researcher notes
Evidence is strongest for affected component and impact class, but weak on version boundaries and remediation specifics in the supplied bundle. Avoid assuming all OkHttp users are affected; the condition is tied to okhttp-brotli and BrotliInterceptor processing malicious Brotli responses.
Mitigation direction
- Inventory applications using com.squareup.okhttp3:okhttp-brotli and BrotliInterceptor.
- Check Square OkHttp and JFrog guidance for fixed versions or official mitigations.
- Update the dependency if vendor guidance identifies a safe release.
- Disable or restrict BrotliInterceptor where Brotli support is not required.
- Reduce MitM risk with strong TLS validation and controlled proxy paths.
Validation and detection
- Run software composition analysis for com.squareup.okhttp3:okhttp-brotli usage.
- Review code paths that enable BrotliInterceptor in OkHttp clients.
- Identify outbound requests to untrusted or user-controlled URLs.
- Confirm dependency versions against current vendor guidance.
- Review availability telemetry for client crashes, hangs, or memory pressure.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-400: Exact CWE lookup
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Open ATT&CK lookupCVE-2023-3782 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H2.23.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.9MediumVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/square/okhttp/issues/7738CVE reference
- https://research.jfrog.com/vulnerabilities/okhttp-client-brotli-dos/CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.