Security readout for executives and security teams
Plain-English summary
CVE-2019-13126 is a denial-of-service issue in NATS Server before 2.0.2. A remote client can send a crafted request that triggers an integer overflow and crashes the server. If authentication is enabled, the attacker must first authenticate. No supplied source shows active exploitation.
Executive priority
Prioritize remediation for internet-facing or shared internal NATS brokers because a crash can disrupt message-driven systems. Lower priority may be reasonable for isolated, authenticated instances already planned for upgrade, but unsupported old versions should not remain in production.
Technical view
The public record describes an integer overflow reachable through crafted client input in NATS Server versions before 2.0.2, resulting in process crash. The available sources do not provide CVSS, CWE mapping, or broader affected-product metadata beyond NATS Server before 2.0.2.
Likely exposure
Exposure is most likely where NATS Server versions earlier than 2.0.2 accept connections from untrusted networks or broad internal user populations. Authenticated deployments reduce unauthenticated risk but remain exposed to valid users or stolen credentials.
Exploitation context
The source bundle supports remote crash potential, not code execution or data theft. CISA KEV status is false, and no cited source claims active exploitation. Details are limited, so treat exploit prevalence as unproven.
Researcher notes
Evidence is sparse: the CVE record names integer overflow and crash impact, while the GitHub PR appears to be the confirmed fix reference. No CVSS, CWE, exploit maturity, or detailed affected CPE data is supplied.
Mitigation direction
- Upgrade NATS Server to version 2.0.2 or later.
- Restrict NATS listener access to trusted networks and services.
- Require authentication where NATS is not strictly private.
- Review vendor guidance and the referenced fix before deployment.
- Monitor NATS restarts and crash loops until upgraded.
Validation and detection
- Inventory all NATS Server deployments and recorded versions.
- Flag any NATS Server instance older than 2.0.2.
- Confirm whether NATS is reachable from untrusted networks.
- Verify authentication is enabled where exposure cannot be fully isolated.
- Review logs for unexpected crashes or restart loops.
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
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CVE-2019-13126 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.twistlock.com/labs-blog/finding-dos-vulnerability-nats-go-fuzz-cve-2019-13126/CVE reference · x_refsource_MISC
- https://github.com/nats-io/nats-server/pull/1053CVE reference · x_refsource_CONFIRM
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.