CVE-2013-1821

Ruby vulnerability

CVSS

5.0

EPSS

6.7%

EPSS pct

93th

Exploited

No known

lib/rexml/text.rb in the REXML parser in Ruby before 1.9.3-p392 allows remote attackers to cause a denial of service (memory consumption and crash) via crafted text nodes in an XML document, aka an XML Entity Expansion (XEE) attack.

Affected vendor

Ruby Lang

Affected product

Ruby

CVSS vector

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

Weakness type (CWE)

CWE-20 — Improper Input Validation

Published

2013-04-09

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no authentication. Successful exploitation leads to partial impact to availability.

Its EPSS score of 6.7% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 93% of all scored CVEs.

Check your external exposure to CVE-2013-1821

Confirm whether Ruby Lang Ruby is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2013-1821.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2013-1821

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2013-1821 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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