CVE-2015-4411: The Moped::BSON::ObjecId.legal? method in mongodb/bson-ruby before 3.0.4 as used in rubygem-moped allows remot

Q: How do I fix CVE-2015-4411?

bson: upgrade to 3.0.4; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2015-4411 being exploited?

CVE-2015-4411 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2015-4411 affect?

CVE-2015-4411 affects bson, fedora. Severity is high (CVSS 7.5). The Moped::BSON::ObjecId.legal? method in mongodb/bson-ruby before 3.0.4 as used in rubygem-moped allows remote attackers to cause a denial of service (worker resource consumption) via a crafted string. NOTE: This issue is due to an incompl

Q: How urgent is CVE-2015-4411?

Priority 60/100. High severity; EPSS top 6%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADEMITIGATE

CVE-2015-4411 is a high-severity flaw (CVSS 7.5) affecting bson, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Moped::BSON::ObjecId.legal? method in mongodb/bson-ruby before 3.0.4 as used in rubygem-moped allows remote attackers to cause a denial of service (worker resource consumption) via a crafted string. NOTE: This issue is due to an incomplete fix to CVE-2015-4410.

Why this priority

High severity
EPSS top 6%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	6.4% (top 6%)
CISA exploited list	No
Weakness	CWE-400
Published	2020-02-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: fedoraproject · mongodb

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-02-20 17:15 UTCPublished CVE record published
2026-06-17 00:27 UTCUpdated Record last modified

mongodb bson UPGRADE

Affected: < 3.0.4

Fixed in: 3.0.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy bson || rpm -q bson || bson --version

2. UPGRADE to 3.0.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade bson

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade bson

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

fedoraproject fedora MITIGATE

Affected: 21 · 22

Fixed in: no fixed release known

Safe to downgrade to: a release before 21

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2015-4411?

bson: upgrade to 3.0.4; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2015-4411 being exploited?

CVE-2015-4411 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2015-4411 affect?

CVE-2015-4411 affects bson, fedora. Severity is high (CVSS 7.5). The Moped::BSON::ObjecId.legal? method in mongodb/bson-ruby before 3.0.4 as used in rubygem-moped allows remote attackers to cause a denial of service (worker resource consumption) via a crafted string. NOTE: This issue is due to an incompl

How urgent is CVE-2015-4411?

Priority 60/100. High severity; EPSS top 6%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

MongoDB vulnerabilities · Ruby vulnerabilities

Related CVEs

CVE-2020-7610 CRITICAL 9.8 UPGRADE All versions of bson before 1.1.4 are vulnerable to Deserialization of Untrusted Data
CVE-2015-4412 CRITICAL 9.8 DOWNGRADE BSON injection vulnerability in the legal? function in BSON (bson-ruby) gem before 3.0.4 for Ruby allows remot

References

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