CVE-2018-0739

MEDIUMEPSS 97th pctl

6.5

CVSS v3

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).

CWE-674

How to fix

Remediation Available

libtomcryptDebian

Fixed in:1.18.2-1CVE-2018-0739

libssl1.0.0Ubuntu

Fixed in:1.0.1f-1ubuntu2.24USN-3611-1

Fixed in:1.0.2g-1ubuntu4.11USN-3611-1

opensslUbuntu

Fixed in:1.0.1f-1ubuntu2.24USN-3611-1

Fixed in:1.0.2g-1ubuntu4.11USN-3611-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

18.93%probability of exploitation in 30 days

97thpercentile

Very high risk: more likely to be exploited than 97% of all known CVEs.

References

Related Vulnerabilities

Other CWE-674 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-45105	Medium	5.9	100%	-	Fix
CVE-2024-25111	High	8.6	65%	-	Fix
CVE-2023-50269	High	8.6	58%	-	Fix
CVE-2021-42697	High	7.5	36%	-	Fix
CVE-2007-1285	High	7.5	18%	-	Fix
CVE-2017-8537	Medium	5.5	17%	-	-

Common questions

How do I fix CVE-2018-0739?

Published advisories record a fix for 3 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2018-0739 being actively exploited?

Not that we know of. CVE-2018-0739 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 18.9% is the estimated probability that it will be exploited in the next 30 days. That is higher than 97% of all scored CVEs.

How severe is CVE-2018-0739?

CVE-2018-0739 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2018-0739 affect?

Published advisories record a fix for libtomcrypt (Debian), libssl1.0.0 (Ubuntu), openssl (Ubuntu). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.