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CVE-2018-20573

23
FAUCET Score

CVE-2018-20573 describes a denial-of-service vulnerability in yaml-cpp (aka LibYaml-C++) version 0.6.2, where a specially crafted YAML file can cause a stack consumption and application crash. This vulnerability has a CVSS score of 6.5 (Medium), indicating it can be exploited remotely with low attack complexity, requiring user interaction, and leading to high availability impact. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
0.6.2CPE matchmatch criteria
cpe:2.3:a:yaml-cpp_project:yaml-cpp:0.6.2:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.5MEDIUM

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.54%
Probability of exploitation in next 30 days
EPSS Percentile
83.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0254 is in the 92nd percentile among its peer group of 26,209 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (13)

microsoftpatch availablevia msrc
Product: 16963-16823Fixed in: 0.6.2-6
microsoftpatch availablevia msrc
Product: cm1 yaml-cpp 0.6.2-6 on CBL Mariner 1.0Fixed in: 0.6.2-6
microsoftpatch availablevia msrc
Product: 16962-16820Fixed in: 0.6.2-6
microsoftpatch availablevia msrc
Product: cbl2 yaml-cpp 0.6.2-6 on CBL Mariner 2.0Fixed in: 0.6.2-6
redhatvendor investigatingvia redhat_api
Product: Red Hat OpenStack Platform 8 (Liberty)Fixed in: yaml-cpp
redhatvendor investigatingvia redhat_api
Product: Red Hat OpenStack Platform 10 (Newton)Fixed in: yaml-cpp
redhatvendor investigatingvia redhat_api
Product: Red Hat OpenStack Platform 13 (Queens)Fixed in: yaml-cpp
redhatvendor investigatingvia redhat_api
Product: Red Hat OpenStack Platform 9 (Mitaka)Fixed in: yaml-cpp
redhatno patchvia redhat_api
Product: Red Hat OpenStack Platform 14 (Rocky)Fixed in: yaml-cpp
redhatend of lifevia redhat_api
Product: Red Hat Satellite 6Fixed in: yaml-cpp
redhatend of lifevia redhat_api
Product: Red Hat Software CollectionsFixed in: rh-mongodb32-yaml-cpp
redhatend of lifevia redhat_api
Product: Red Hat Software CollectionsFixed in: rh-mongodb34-yaml-cpp
redhatend of lifevia redhat_api
Product: Red Hat Software CollectionsFixed in: rh-mongodb36-yaml-cpp

Vendor Advisories (2)

redhatCVE-2018-20573Low

yaml-cpp: DoS in Scanner::EnsureTokensInQueue function in yaml-cpp

Dec 28, 2018
microsoft2018-Dec/CVE-2018-20573Moderate

The Scanner::EnsureTokensInQueue function in yaml-cpp (aka LibYaml-C++) 0.6.2 allows remote attackers to cause a denial of service (stack consumption and application crash) via a crafted YAML file.

Dec 11, 2018

References

seclists.org / fulldisclosure/2024/Nov/0
github.com / jbeder/yaml-cpp/issues/655
ExploitThird Party Advisory