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Fencer Intel
medium 5.5

CVE-2018-1099 json

DNS Rebinding in etcd

published 8y ago modified last mo. also GHSA-wf43-55jj-vwq8 , EUVD-2022-1226

cvss
5.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits
0
none known

Summary

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).

Patch / fix

  • go go.etcd.io/etcd 3.4.0
  • etcd Debian 14, Debian 13, Debian 12 3.4.23-1

debian advisories DEBIAN-CVE-2018-1099

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-1099 updated cvss 5.0

etcd: DNS rebinding vulnerability in etcd server

  • Red Hat Enterprise Linux 7 etcd, etcd3
    affected: workaround, no fix planned “Configure and enable authentication on the etcd server or secure your client connection via HTTPS.”
  • Red Hat OpenShift Enterprise 3 atomic-openshift, atomic-openshift-pod, atomic-openshift-node, atomic-openshift-tests, atomic-openshift-master, atomic-openshift-clients, +13 more
    affected: workaround, no fix available “Configure and enable authentication on the etcd server or secure your client connection via HTTPS.”
  • Red Hat Storage 3 etcd
    affected: workaround, no fix planned “Configure and enable authentication on the etcd server or secure your client connection via HTTPS.”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.50% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/coreos/etcd/issues/9353 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 5.5 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:N/I:P/A:N
GitHub 3.0 5.5 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
go go.etcd.io/etcd
<3.4.0
3.4.0

Affected products

  • Red Hat, Inc. etcd

Classification

Weakness
  • CWE-20 Improper Input Validation
  • CWE-350 Reliance on Reverse DNS Resolution for a Security-Critical Action

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.