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CVE-2018-20997

29
FAUCET Score

CVE-2018-20997 is a critical use-after-free vulnerability affecting the openssl crate for Rust, specifically versions prior to 0.10.9, impacting the CMS Signing functionality. With a CVSS score of 9.8, this vulnerability allows for remote exploitation with low attack complexity, potentially leading to complete compromise of confidentiality, integrity, and availability. Despite its high severity, there is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.10.9CPE matchmatch criteria
cpe:2.3:a:rust-openssl_project:rust-openssl:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.74%
Probability of exploitation in next 30 days
EPSS Percentile
75.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0174 is in the 63rd percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

rustpatch availablevia ghsa
Product: opensslFixed in: 0.10.9

Vendor Advisories (1)

rustGHSA-xjxc-vfw2-cg96critical

Use after free in openssl

Aug 25, 2021

References

rustsec.org / advisories/RUSTSEC-2018-0010.html
Third Party Advisory