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NVD / CVE Program· CNA GitHub_M

CVE-2020-5216: Limited header injection when using dynamic overrides with user input in RubyGems secure_headers

Noroxi assessment

Priority: Monitor (action score 23/100)

  • 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: 1.2% (FIRST EPSS); higher than 68.1% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Twitter secure_headers 6.3.0.

Low priority for now. Upgrade to Twitter secure_headers 6.3.0 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

In Secure Headers (RubyGem secure_headers), a directive injection vulnerability is present in versions before 3.9.0, 5.2.0, and 6.3.0. If user-supplied input was passed into append/override_content_security_policy_directives, a newline could be injected leading to limited header injection. Upon seeing a newline in the header, rails will silently create a new Content-Security-Policy header with the remaining value of the original string. It will continue to create new headers for each newline. This has been fixed in 6.3.0, 5.2.0, and 3.9.0.

MediumCVSS 5.8 · v3.1—No exploit Fix available
Published
Jan 22, 2020
Updated
Jun 16, 2026
EPSS
1.2% · 68th percentile

Report tools

JSON

Action score

23

Monitor

Low priority for now.

CVSS
23 / 40 · 5.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.2%

CNA vs NVD score

NVD
5.8
CNA · GitHub_M
4.4
1.4 point gap

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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

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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

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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.

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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
twittersecure headers

Affected versions

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

  • twitter secure headersbefore 3.9.0
  • twitter secure headers5.0.0 and later · before 5.2.0
  • twitter secure headers6.0.0 and later · before 6.3.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • Twitter secure_headers

    • < 3.9.0, >= 5.0.0, < 5.2.0, >= 6.0.0, < 6.3.0affected

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12ruby-secure-headersbefore 6.3.1-16.3.1-1
Red Hat:satellite_capsule:6.8::el7ansible-collection-redhat-satellitebefore 0:1.3.0-1.el7sat0:1.3.0-1.el7sat
Red Hat:satellite_capsule:6.8::el7ansible-runnerbefore 0:1.4.6-1.el7ar0:1.4.6-1.el7ar
Red Hat:satellite_capsule:6.8::el7ansiblerole-foreman_scap_clientbefore 0:0.0.5-1.el7sat0:0.0.5-1.el7sat
Red Hat:satellite_capsule:6.8::el7ansiblerole-insights-clientbefore 0:1.7.1-1.el7sat0:1.7.1-1.el7sat
Red Hat:satellite_capsule:6.8::el7ansiblerole-satellite-receptor-installerbefore 0:0.6.13-1.el7sat0:0.6.13-1.el7sat
Red Hat:satellite_capsule:6.8::el7crane-selinuxbefore 0:3.4.0-1.el7sat0:3.4.0-1.el7sat
Red Hat:satellite_capsule:6.8::el7createrepo_cbefore 0:0.7.4-1.el7sat0:0.7.4-1.el7sat
Red Hat:satellite_capsule:6.8::el7createrepo_c-debuginfobefore 0:0.7.4-1.el7sat0:0.7.4-1.el7sat
Red Hat:satellite_capsule:6.8::el7createrepo_c-libsbefore 0:0.7.4-1.el7sat0:0.7.4-1.el7sat
Red Hat:satellite_capsule:6.8::el7foremanbefore 0:2.1.2.19-1.el7sat0:2.1.2.19-1.el7sat
Red Hat:satellite_capsule:6.8::el7foreman-bootloaders-redhatbefore 0:202005201200-1.el7sat0:202005201200-1.el7sat
Red Hat:satellite_capsule:6.8::el7foreman-bootloaders-redhat-tftpbootbefore 0:202005201200-1.el7sat0:202005201200-1.el7sat
Red Hat:satellite_capsule:6.8::el7foreman-debugbefore 0:2.1.2.19-1.el7sat0:2.1.2.19-1.el7sat
Red Hat:satellite_capsule:6.8::el7foreman-discovery-imagebefore 1:3.6.7-1.el7sat1:3.6.7-1.el7sat
Red Hat:satellite_capsule:6.8::el7foreman-discovery-image-servicebefore 0:1.0.0-3.el7sat0:1.0.0-3.el7sat
Red Hat:satellite_capsule:6.8::el7foreman-discovery-image-service-tuibefore 0:1.0.0-3.el7sat0:1.0.0-3.el7sat
Red Hat:satellite_capsule:6.8::el7foreman-installerbefore 1:2.1.2.8-1.el7sat1:2.1.2.8-1.el7sat
Red Hat:satellite_capsule:6.8::el7foreman-installer-katellobefore 1:2.1.2.8-1.el7sat1:2.1.2.8-1.el7sat
Red Hat:satellite_capsule:6.8::el7foreman-proxybefore 0:2.1.2-2.el7sat0:2.1.2-2.el7sat
Red Hat:satellite_capsule:6.8::el7foreman-proxy-contentbefore 0:3.16.0-1.el7sat0:3.16.0-1.el7sat
Red Hat:satellite_capsule:6.8::el7foreman-proxy-journaldbefore 0:2.1.2-2.el7sat0:2.1.2-2.el7sat
Red Hat:satellite_capsule:6.8::el7futurebefore 0:0.16.0-11.el7sat0:0.16.0-11.el7sat
Red Hat:satellite_capsule:6.8::el7goferbefore 0:2.12.5-7.el7sat0:2.12.5-7.el7sat

+96

Same product

twitter: all records

Other highest-scoring records for the same primary product.

  • CVE-2020-5217Directive injection when using dynamic overrides with user input in RubyGems secure_headers
    24Monitor

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
Twitter secure_headers6.3.0 · descriptionVendor (CNA)
debian:ruby-secure-headers6.3.1-1 · Debian:12Package registry (OSV)
red hat:ansible-collection-redhat-satellite0:1.3.0-1.el7sat · Red Hat:satellite_capsule:6.8::el7Package registry (OSV)
red hat:ansible-runner0:1.4.6-1.el7ar · Red Hat:satellite_capsule:6.8::el7Package registry (OSV)
red hat:ansiblerole-foreman_scap_client0:0.0.5-1.el7sat · Red Hat:satellite_capsule:6.8::el7Package registry (OSV)
red hat:ansiblerole-insights-client0:1.7.1-1.el7sat · Red Hat:satellite_capsule:6.8::el7Package registry (OSV)
red hat:ansiblerole-satellite-receptor-installer0:0.6.13-1.el7sat · Red Hat:satellite_capsule:6.8::el7Package registry (OSV)
red hat:crane-selinux0:3.4.0-1.el7sat · Red Hat:satellite_capsule:6.8::el7Package registry (OSV)
red hat:createrepo_c0:0.7.4-1.el7sat · Red Hat:satellite_capsule:6.8::el7Package registry (OSV)
red hat:createrepo_c-debuginfo0:0.7.4-1.el7sat · Red Hat:satellite_capsule:6.8::el7Package registry (OSV)
red hat:createrepo_c-libs0:0.7.4-1.el7sat · Red Hat:satellite_capsule:6.8::el7Package registry (OSV)
red hat:foreman0:2.1.2.19-1.el7sat · Red Hat:satellite_capsule:6.8::el7Package registry (OSV)
red hat:foreman-bootloaders-redhat0:202005201200-1.el7sat · Red Hat:satellite_capsule:6.8::el7Package registry (OSV)
red hat:foreman-bootloaders-redhat-tftpboot0:202005201200-1.el7sat · Red Hat:satellite_capsule:6.8::el7Package registry (OSV)
RubyGems:secure_headers3.9.0Package registry (OSV)
RubyGems:secure_headers5.2.0Package registry (OSV)
RubyGems:secure_headers6.3.0Package 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.

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

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
low · data or configuration can be modified
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality impact
None
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-113 · Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

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.

Change log

  1. Fix✗ → ✓

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

References

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

All records