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CVE Record

CVE-2018-1099: DNS rebinding vulnerability found in etcd 3.3.1 and earlier.

DNS rebinding vulnerability found in etcd 3.3.1 and earlier. An attacker can control his DNS records to direct to localhost, and trick the browser into sending requests to localhost (or any other address).

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2018-1099 affects etcd 3.3.1 and earlier. A malicious site could abuse DNS rebinding so a victim’s browser sends requests to localhost or another internal address. Business risk depends on whether etcd is reachable from user browsers and whether those requests can affect sensitive cluster data.

Executive priority

Prioritize if etcd supports production systems or stores cluster configuration, secrets, or service discovery data. Without active exploitation evidence or CVSS in the bundle, handle as a targeted exposure review and upgrade validation rather than an internet-wide emergency.

Technical view

The issue is improper input handling in etcd related to DNS rebinding. The public description says an attacker controlling DNS records can redirect browser-originated traffic to localhost or another address, potentially reaching an etcd service that was not intended to be exposed to web content.

Likely exposure

Organizations running etcd 3.3.1 or earlier are in scope, especially developer workstations, admin hosts, or internal systems where browsers can reach local or private etcd endpoints.

Exploitation context

The provided sources do not show CISA KEV listing or confirmed active exploitation. Exploitation depends on DNS control, browser interaction, and reachable etcd endpoints; the bundle does not provide exploit maturity, CVSS, or confirmed attack reports.

Researcher notes

Evidence is limited to the CVE description, affected version statement, Red Hat Bugzilla, an etcd GitHub issue, and Fedora advisories. The bundle does not include a CVSS vector, exact fixed upstream version, proof of exploitation, or detailed vendor remediation text.

Mitigation direction

  • Check Red Hat, Fedora, and etcd project guidance for the fixed package or supported upgrade path.
  • Inventory etcd deployments and identify any versions at or before 3.3.1.
  • Restrict etcd access to trusted hosts and management networks only.
  • Review browser-accessible localhost or internal admin endpoints on operator workstations.
  • Treat exposed unauthenticated etcd services as urgent until validated.

Validation and detection

  • Confirm installed etcd versions across servers, containers, and packaged systems.
  • Review network paths from user browsers to etcd listener addresses.
  • Check whether etcd is bound to localhost, private interfaces, or broader networks.
  • Verify applicable vendor advisories were applied to Fedora or Red Hat managed systems.
  • Document compensating controls where immediate upgrade status is unclear.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2018-1099 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Red Hat, Inc.etcd3.3.1 and earlierListed
Weakness

CWE details

CWE-20

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.