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Fencer Intel
critical 9.8

CVE-2015-1820 json

rest-client Gem Vulnerable to Session Fixation

published 2017-08-09 9 y ago modified 2026-06-17 4 mo ago also GHSA-3fhf-6939-qg8p , EUVD-2018-0360

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.3%
EPSS 4.3% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

REST client for Ruby (aka rest-client) before 1.8.0 allows remote attackers to conduct session fixation attacks or obtain sensitive cookie information by leveraging passage of cookies set in a response to a redirect.

Patch / fix

  • rubygems rest-client 1.8.0
  • ruby-rest-client Debian 14, Debian 13, Debian 12 1.6.7-6

debian advisories DEBIAN-CVE-2015-1820

  • tfm satellite capsule 6.9, satellite 6.9 6.1-4.el7sat
  • kobo satellite capsule 6.9, satellite 6.9 0.5.1-1.el7sat
  • pulp satellite capsule 6.9, satellite 6.9 2.21.5-2.el7sat
  • gofer satellite capsule 6.9, satellite 6.9 2.12.5-7.el7sat
  • future satellite capsule 6.9, satellite 6.9 0.16.0-11.el7sat
  • ostree satellite capsule 6.9, satellite 6.9 2017.1-2.atomic.el7
  • foreman satellite capsule 6.9, satellite 6.9 2.3.1.20-1.el7sat
  • katello satellite capsule 6.9, satellite 6.9 3.18.1-3.el7sat

red hat advisories RHSA-2021:1313RHBA-2015:1100

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-2015-1820 updated cvss 0.0

rubygem-rest-client: session fixation vulnerability Set-Cookie headers present in an HTTP 30x redirection responses

  • Red Hat OpenStack Foreman rubygem-rest-client, ruby193-rubygem-rest-client Red Hat Enterprise Linux OpenStack Platform 6 (Juno) Installer rubygem-rest-client, ruby193-rubygem-rest-client Red Hat Enterprise MRG 2 rubygem-rest-client Red Hat OpenShift Enterprise 2 ruby193-rubygem-rest-client Red Hat OpenStack Platform 4 rubygem-rest-client, ruby193-rubygem-rest-client Red Hat Satellite 6 rubygem-rest-client
    +1 more products
    Red Hat Subscription Asset Manager rubygem-rest-client, ruby193-rubygem-rest-client
    affected: workaround, no fix planned “Will not fix”
  • Red Hat CloudForms Management Engine 5.4 wmi 1.3.14-1.el6cf, cfme 5.4.0.5-1.el6cf, lshw B.02.16-4.el6cf, prince 9.0r2-4.el6cf, libdnet 1.12-11.el6cf, pyliblzma 0.5.3-7.el6cf, +21 more
    fixed: vendor fix RHBA-2015:1100
  • Red Hat Satellite 6.9 tfm 6.1-4.el7sat, kobo 0.5.1-1.el7sat, pulp 2.21.5-2.el7sat, gofer 2.12.5-7.el7sat, libsolv 0.7.12-2.el7pc, receptor 0.6.3-1.el7ar, +646 more Red Hat Satellite Capsule 6.9 tfm 6.1-4.el7sat, kobo 0.5.1-1.el7sat, pulp 2.21.5-2.el7sat, gofer 2.12.5-7.el7sat, libsolv 0.7.12-2.el7pc, future 0.16.0-11.el7sat, +254 more
    fixed: vendor fix RHSA-2021:1313

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

4.35% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
rubygems rest-client
>=1.6.1.a, <1.8.0
1.8.0

Classification

Weakness

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.