CVE-2015-1820: rest-client_project rest-client Session Fixation
Vulnerability summary
CVE-2015-1820 is a critical (CVSS 9.8) Session Fixation vulnerability in rest-client_project rest-client. EPSS estimates a 4.35% chance of exploitation in the next 30 days, higher than 91.2% of scored vulnerabilities.
Severe, CVSS 9.8 (NVD); no exploitation reported by the 5 checked sources; EPSS 4% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 3Timeline
- 09-08-2017PublishedVulnerability first disclosed.
- 06-08-2024Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · RubygemsEcosystem advisory · calculated9.8CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
4.35%
Chance of exploitation in the next 30 days
Percentile
91%
Versus all other CVEs
30-day change
No change 0.00 pp
From 4.35% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Debian1 product
- ruby-rest-client< 1.6.7-6
Rest-client_project1 product
- rest-client≤ 1.7.3
RubyGems1 product
- rest-client≥ 1.6.1.a, < 1.8.0
Ubuntu1 product
- ruby-rest-client< 1.8.0-2ubuntu1
4 vendors · 4 products
References
11 links- bugzilla.redhat.com/show_bug.cgi?id=1205291X Refsource CONFIRMIssue TrackingPatchThird Party AdvisoryVDB EntryWEB
