CVE-2019-16377
Consul gem insufficient authentication check - Multiple powers in one controller are not always checked correctly
The makandra consul gem through 1.0.2 for Ruby has Incorrect Access Control.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
The makandra consul gem through 1.0.2 for Ruby has Incorrect Access Control.
- Record
CVE-2019-16377- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Updated
- 2026-11-02
CVE List No score
The makandra consul gem through 1.0.2 for Ruby has Incorrect Access Control.
- Record
CVE-2019-16377- Updated
- 2026-11-02
EUVDEUVD-2019-0660 No score
The makandra consul gem through 1.0.2 for Ruby has Incorrect Access Control.
- Record
EUVD-2019-0660- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-8jhx-9gf4-hhf5
Consul gem insufficient authentication check - Multiple powers in one controller are not always checked correctly
With the consul ruby gem before 1.0.3, if a controller checks multiple powers using :if or :except conditions, these conditions are erroneously applied to all power checks in that controller. This can lead to skipped power checks and hence unauthenticated access to certain controller actions.
- Record
GHSA-8jhx-9gf4-hhf5- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-284
- Updated
- 2026-11-02
OSV
The makandra consul gem through 1.0.2 for Ruby has Incorrect Access Control.
- Record
CVE-2019-16377- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-03
OSVGHSA-8jhx-9gf4-hhf5
Consul gem insufficient authentication check - Multiple powers in one controller are not always checked correctly
With the consul ruby gem before 1.0.3, if a controller checks multiple powers using :if or :except conditions, these conditions are erroneously applied to all power checks in that controller. This can lead to skipped power checks and hence unauthenticated access to certain controller actions.
- Record
GHSA-8jhx-9gf4-hhf5- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-284
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
consulRubyGems |
before 1.0.3 | 1.0.3 |
consulRubyGems |
before 1.0.3, plus listed versions 0.1.00.1.10.1.20.10.00.10.1 Show 32 moreShow less0.10.20.11.00.11.10.11.20.12.00.12.10.12.20.12.30.12.40.13.00.13.10.13.20.14.00.14.10.2.00.2.10.2.20.2.30.3.00.4.00.4.10.4.20.5.00.6.00.6.10.7.00.8.00.9.00.9.11.0.01.0.11.0.2 |
1.0.3 |
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | OSV | |
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2019-16377 is a critical vulnerability (CVSS 9.8) in Makandra Consul, published September 23, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.64%, the 85th percentile. Fixed in consul 1.0.3.
References
rubygems.org/gems/consul
github.com/makandra/consul/issues/49
nvd.nist.gov/vuln/detail/CVE-2019-16377