Skip to content
Noroxi
CVE-2006-6303· NVD / CVE Program· CNA mitre

The read_multipart function in cgi.rb in Ruby before 1.8.5-p2 does not properly detect boundaries in MIME multipart content, which allows re

Noroxi assessment

Priority: Monitor (action score 21/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 3.8% (FIRST EPSS); higher than 89.9% of all records.
  • No special conditions are required; it is repeatable.
  • Fixed version: irb (Red Hat:enterprise_linux:2.1::as) 0:1.6.4-6.el2; ruby (Red Hat:enterprise_linux:2.1::as) 0:1.6.4-6.el2; ruby-devel (Red Hat:enterprise_linux:2.1::as) 0:1.6.4-6.el2.

Low priority for now. Upgrade to irb (Red Hat:enterprise_linux:2.1::as) 0:1.6.4-6.el2; ruby (Red Hat:enterprise_linux:2.1::as) 0:1.6.4-6.el2; ruby-devel (Red Hat:enterprise_linux:2.1::as) 0:1.6.4-6.el2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

The read_multipart function in cgi.rb in Ruby before 1.8.5-p2 does not properly detect boundaries in MIME multipart content, which allows remote attackers to cause a denial of service (infinite loop) via crafted HTTP requests, a different issue than CVE-2006-5467.

MediumCVSS 5.0 · v2.0—No exploit Fix available
Published
Dec 6, 2006
Updated
Jun 16, 2026
EPSS
3.8% · 89th percentile

Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
20 / 40 · 5.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 3.8%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2006-6303

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for yukihiro matsumoto records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
yukihiro matsumotoruby

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • yukihiro matsumoto ruby1.8
  • yukihiro matsumoto ruby1.8.1
  • yukihiro matsumoto ruby1.8.2
  • yukihiro matsumoto ruby1.8.2_pre1
  • yukihiro matsumoto ruby1.8.2_pre2
  • yukihiro matsumoto ruby1.8.3
  • yukihiro matsumoto ruby1.8.4
  • yukihiro matsumoto ruby1.8.5

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Red Hat:enterprise_linux:2.1::asirbbefore 0:1.6.4-6.el20:1.6.4-6.el2
Red Hat:enterprise_linux:2.1::asrubybefore 0:1.6.4-6.el20:1.6.4-6.el2
Red Hat:enterprise_linux:2.1::asruby-develbefore 0:1.6.4-6.el20:1.6.4-6.el2
Red Hat:enterprise_linux:2.1::asruby-docsbefore 0:1.6.4-6.el20:1.6.4-6.el2
Red Hat:enterprise_linux:2.1::asruby-libsbefore 0:1.6.4-6.el20:1.6.4-6.el2
Red Hat:enterprise_linux:2.1::asruby-tcltkbefore 0:1.6.4-6.el20:1.6.4-6.el2
Red Hat:enterprise_linux:3::asirbbefore 0:1.6.8-12.el30:1.6.8-12.el3
Red Hat:enterprise_linux:3::asrubybefore 0:1.6.8-12.el30:1.6.8-12.el3
Red Hat:enterprise_linux:3::asruby-debuginfobefore 0:1.6.8-12.el30:1.6.8-12.el3
Red Hat:enterprise_linux:3::asruby-develbefore 0:1.6.8-12.el30:1.6.8-12.el3
Red Hat:enterprise_linux:3::asruby-docsbefore 0:1.6.8-12.el30:1.6.8-12.el3
Red Hat:enterprise_linux:3::asruby-libsbefore 0:1.6.8-12.el30:1.6.8-12.el3
Red Hat:enterprise_linux:3::asruby-modebefore 0:1.6.8-12.el30:1.6.8-12.el3
Red Hat:enterprise_linux:3::asruby-tcltkbefore 0:1.6.8-12.el30:1.6.8-12.el3
Red Hat:enterprise_linux:4::asirbbefore 0:1.8.1-7.EL4.8.10:1.8.1-7.EL4.8.1
Red Hat:enterprise_linux:4::asrubybefore 0:1.8.1-7.EL4.8.10:1.8.1-7.EL4.8.1
Red Hat:enterprise_linux:4::asruby-debuginfobefore 0:1.8.1-7.EL4.8.10:1.8.1-7.EL4.8.1
Red Hat:enterprise_linux:4::asruby-develbefore 0:1.8.1-7.EL4.8.10:1.8.1-7.EL4.8.1
Red Hat:enterprise_linux:4::asruby-docsbefore 0:1.8.1-7.EL4.8.10:1.8.1-7.EL4.8.1
Red Hat:enterprise_linux:4::asruby-libsbefore 0:1.8.1-7.EL4.8.10:1.8.1-7.EL4.8.1
Red Hat:enterprise_linux:4::asruby-modebefore 0:1.8.1-7.EL4.8.10:1.8.1-7.EL4.8.1
Red Hat:enterprise_linux:4::asruby-tcltkbefore 0:1.8.1-7.EL4.8.10:1.8.1-7.EL4.8.1

Same product

yukihiro matsumoto: all records

Other highest-scoring records for the same primary product.

  • CVE-2005-1992The XMLRPC server in utils.rb for the ruby library (libruby) 1.8 sets an invalid default value that prevents "security protection" using han
    32Monitor
  • CVE-2005-2337Ruby 1.6.x up to 1.6.8, 1.8.x up to 1.8.2, and 1.9.0 development up to 2005-09-01 allows attackers to bypass safe level and taint flag prote
    31Monitor
  • CVE-2006-3694Multiple unspecified vulnerabilities in Ruby before 1.8.5 allow remote attackers to bypass "safe level" checks via unspecified vectors invol
    27Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2004-0983Mar 1, 2005 · The CGI module in Ruby 1.6 before 1.6.8, and 1.8 before 1.8.2, allows remote attackers to cause a denial of service (infinite loop and CPU c
    21Monitor
  • ← EarlierCVE-2006-1931Apr 20, 2006 · The HTTP/XMLRPC server in Ruby before 1.8.2 uses blocking sockets, which allows attackers to cause a denial of service (blocked connections)
    23Monitor
  • ← EarlierCVE-2006-5467Oct 27, 2006 · The cgi.rb CGI library for Ruby 1.8 allows remote attackers to cause a denial of service (infinite loop and CPU consumption) via an HTTP req
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
red hat:irb0:1.8.1-7.EL4.8.1 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:ruby0:1.8.1-7.EL4.8.1 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:ruby-debuginfo0:1.8.1-7.EL4.8.1 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:ruby-devel0:1.8.1-7.EL4.8.1 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:ruby-docs0:1.8.1-7.EL4.8.1 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:ruby-libs0:1.8.1-7.EL4.8.1 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:ruby-mode0:1.8.1-7.EL4.8.1 · Red Hat:enterprise_linux:4::asPackage registry (OSV)
red hat:ruby-tcltk0:1.8.1-7.EL4.8.1 · Red Hat:enterprise_linux:4::asPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
P · the service can be disrupted
Attack complexity
Low
Confidentiality impact
None
Integrity impact
None
Availability impact
P

Weakness class (CWE)

CWE-399 · Resource Management Errors

CVSS vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (19 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records