CVE-2015-1855: debian debian_linux Improper Input Validation
Vulnerability summary
CVE-2015-1855 is a medium (CVSS 5.9) Improper Input Validation vulnerability in debian debian_linux. EPSS estimates a 2.81% chance of exploitation in the next 30 days, higher than 86.5% of scored vulnerabilities.
Not severe (CVSS 5.9, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 7 · Related 6Timeline
- 29-11-2019PublishedVulnerability first disclosed.
- 06-08-2024Last modifiedVulnerability information updated.
Description
verify_certificate_identity in the OpenSSL extension in Ruby before 2.0.0 patchlevel 645, 2.1.x before 2.1.6, and 2.2.x before 2.2.2 does not properly validate hostnames, which allows remote attackers to spoof servers via vectors related to (1) multiple wildcards, (1) wildcards in IDNA names, (3) case sensitivity, and (4) non-ASCII characters.
CVSS metrics
3 scores · 2 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS trend
Probability
2.81%
Chance of exploitation in the next 30 days
Percentile
87%
Versus all other CVEs
30-day change
No change 0.00 pp
From 2.81% 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.
Debian4 products
- ruby1.8< 1.8.7.302-2squeeze4 | < 1.8.7.358-7.1+deb7u3
- ruby1.9.1< 1.9.3.194-8.1+deb7u5
- ruby2.1< 2.1.5-2+deb8u1
- debian_linuxEOL7.0 | 8.0 | 9.0
Puppet2 products
- puppet_agent1.0.0
- puppet_enterprise≥ 3.0.0, < 3.8.0
Ruby-lang2 products
Ubuntu2 products
- ruby1.9.1< 1.9.3.484-2ubuntu1.3
- ruby2.0< 2.0.0.484-1ubuntu2.4
Mageia1 product
- ruby< 2.0.0.p645-1.mga4
Ruby1 product
- ruby< 2.0.0 patchlevel 645 | 2.1.x before 2.1.6 | and 2.2.x before 2.2.2
6 vendors · 12 products
References
13 links
- www.ruby-lang.org/en/news/2015/04/13/ruby-openssl-hostname-matching-vulnerability/X Refsource MISCVendor AdvisoryWEB