How severe is CVE-2013-4389?

No CVSS score has been assigned to CVE-2013-4389 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2013-4389?

CVE-2013-4389 affects the following packages: actionmailer (RubyGems). Ecosystems affected: RubyGems.

How do I fix CVE-2013-4389?

Update actionmailer to 3.2.15 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2013-4389 is resolved across your whole dependency graph.

How do I detect CVE-2013-4389 in my RubyGems dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for actionmailer, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2013-4389 if there is no patch (or I can't update yet)?

Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Is CVE-2013-4389 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2013-4389, including 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2013-4389?

CVE-2013-4389 has an EPSS (Exploit Prediction Scoring System) score of 3.1%, placing it in the 88th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2013-4389?

CVE-2013-4389 is classified as CWE-134 (CWE-134). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2013-4389 published, and has it been updated?

CVE-2013-4389 was published on October 24, 2017 and was last updated on December 6, 2024. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

💎 RubyGems

Not in CISA KEV

CVE-2013-4389 — actionmailer

CVE-2013-4389 is a CWE-134 vulnerability in actionmailer. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for actionmailer — see the affected versions and patch details below.

actionmailer email address processing causes Denial of service

Published

Oct 24, 2017

Updated

Dec 6, 2024

Affected

1 pkg

Patched

1 / 1

Exploits

1 known

Exploitation data as of Oct 22, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

3.1%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs88th percentile — riskier than 88% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

💎actionmailer

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects RubyGems packages — download data is not available via public APIs for these ecosystems.

Description

Multiple format string vulnerabilities in log_subscriber.rb files in the log subscriber component in Action Mailer in Ruby on Rails 3.x before 3.2.15 allow remote attackers to cause a denial of service via a crafted e-mail address that is improperly handled during construction of a log message.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
💎RubyGems	`actionmailer`	≥ 3.0.0&&< 3.2.15	3.2.15`bundle update actionmailer --conservative`

Affected Products

3 products · 5 configurations

debian linuxdebian

1 version

7.0

opensuseopensuse

3 versions

12.212.313.1

Application

railsrubyonrails

≥ 3.0.0 && < 3.2.15

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Multiple format string vulnerabilities in log_subscriber.rb files in the…

groups.google.comNVDAug 2019

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for actionmailer, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update actionmailer to 3.2.15 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2013-4389 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatLow

Red Hat Product Security has rated this issue as having Low security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/. This issue did not affect the versions…

Product	Fixed in	Advisory
CloudForms Management Engine 5.4	`cfme-0:5.4.0.5-1.el6cf`	RHBA-2015:1100

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2013-4389 in your dependencies?

Find it across RubyGems, including transitive dependencies.

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