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CVE-2018-0739

Constructed ASN.1 types with a recursive definition could exceed the stack

Description

Constructed ASN.1 types with a recursive definition (such as can be found in PKCS7) could eventually exceed the stack given malicious input with excessive recursion. This could result in a Denial Of Service attack. There are no such structures used within SSL/TLS that come from untrusted sources so this is considered safe. Fixed in OpenSSL 1.1.0h (Affected 1.1.0-1.1.0g). Fixed in OpenSSL 1.0.2o (Affected 1.0.2b-1.0.2n).

Timeline

  1. ID reserved

    By openssl

  2. · 4 months later

    Published

  3. · 6 years later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2018-0739, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.0Medium6.5CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
18.6% · top 2.7% of all CVEs (9 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.

Affected products

  • OpenSSL · OpenSSL

    • affected Fixed in OpenSSL 1.1.0h (Affected 1.1.0-1.1.0g)
    • affected Fixed in OpenSSL 1.0.2o (Affected 1.0.2b-1.0.2n)

References

34

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .