CVE-2018-20997

highpriority · track · 40EPSS 0.017 · 78 %ileEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.74% (78th) EPSS

CVSS 7.5 · high

Is it mine?

3 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · osv · nvd

EPSS · scored 2026-10-27

An issue was discovered in the openssl crate before 0.10.9 for Rust. A use-after-free occurs in CMS Signing.

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4

v3.09.8criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.09.8criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · OSV

v3.09criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-416USprimaryCWE-416US

affected products (3)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
rust-openssl project rust-openssl< 0.10.9nvdUScpe:2.3:a:rust-openssl_project:rust-openssl:*:*:*:*:*:*:*:*
crates.io openssl0.10.8 → 0.10.9osvUSpkg:cargo/openssl

advisories (2)

Vendor and ecosystem advisories describing this.

GHSA-xjxc-vfw2-cg96Use after free in openssl2021-08-25ghsa · osvUS
An issue was discovered in the openssl crate before 0.10.9 for Rust. A use-after-free occurs in CMS Signing.
RUSTSEC-2018-0010Use after free in CMS Signing2018-06-01vendor · osvUS
Affected versions of the OpenSSL crate used structures after they'd been freed.

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv nvd NVD CVE.org MITRE

published 2019-08-26modified 2026-06-17

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+12281 more

references (4)

External citations — patches, advisories, analysis.

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