How severe is CVE-2017-10784?

CVE-2017-10784 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-10784 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 16% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-10784?

CVE-2017-10784 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-2017-10784?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2017-10784 published?

CVE-2017-10784 was published on 2017-09-19 and last updated on 2026-06-17.

CVE-2017-10784

CVE-2017-10784 is a high-severity vulnerability in Ruby-lang Ruby with a CVSS 3.x base score of 8.8. Its EPSS exploit-prediction score of 16% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-287.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.3
EPSS exploit prediction: 16% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Ruby-lang Ruby
Published: 2017-09-19
Last modified: 2026-06-17

Description

The Basic authentication code in WEBrick library in Ruby before 2.2.8, 2.3.x before 2.3.5, and 2.4.x through 2.4.1 allows remote attackers to inject terminal emulator escape sequences into its log and possibly execute arbitrary commands via a crafted user name.

Frequently asked questions

What is CVE-2017-10784?: The Basic authentication code in WEBrick library in Ruby before 2.2.8, 2.3.x before 2.3.5, and 2.4.x through 2.4.1 allows remote attackers to inject terminal emulator escape sequences into its log and possibly execute arbitrary commands via a crafted user name.
How severe is CVE-2017-10784?: CVE-2017-10784 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-10784 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 16% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-10784?: CVE-2017-10784 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-2017-10784?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2017-10784 published?: CVE-2017-10784 was published on 2017-09-19 and last updated on 2026-06-17.

References

Affected products (14)

cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:2.3.0:*:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:2.3.0:preview1:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:2.3.0:preview2:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:2.3.1:*:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:2.3.2:*:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:2.3.3:*:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:2.3.4:*:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:2.4.0:*:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:2.4.0:preview1:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:2.4.0:preview2:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:2.4.0:preview3:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:2.4.0:rc1:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:2.4.1:*:*:*:*:*:*:*

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Other CWE-287 (Improper Authentication) vulnerabilities

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Browse all CWE-287 (Improper Authentication) vulnerabilities →