CVE-2013-1821

CVE-2013-1821 is a medium-severity vulnerability in Ruby-lang Ruby with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Description

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.

Frequently asked questions

What is CVE-2013-1821?
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.
How severe is CVE-2013-1821?
CVE-2013-1821 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2013-1821 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2013-1821?
CVE-2013-1821 primarily affects Ruby-lang Ruby. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2013-1821?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2013-1821 published?
CVE-2013-1821 was published on 2013-04-09 and last updated on 2026-06-16.

References

Affected products (14)

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