CVE-2018-1000121

HIGHEPSS 95th pctl

7.5

CVSS v3

Description

A NULL pointer dereference exists in curl 7.21.0 to and including curl 7.58.0 in the LDAP code that allows an attacker to cause a denial of service

CWE-476NULL Pointer Dereference

How to fix

Remediation Available

curlAmazon

Fixed in:0:7.55.1-10.amzn2.0.1

curl-debuginfoAmazon

Fixed in:0:7.55.1-10.amzn2.0.1

libcurlAmazon

Fixed in:0:7.55.1-10.amzn2.0.1

libcurl-develAmazon

Fixed in:0:7.55.1-10.amzn2.0.1

nss-pemAmazon

Fixed in:0:1.0.3-5.amzn2

nss-pem-debuginfoAmazon

Fixed in:0:1.0.3-5.amzn2

curlDebian

Fixed in:7.60.0-1CVE-2018-1000121

curlUbuntu

Fixed in:7.35.0-1ubuntu2.15USN-3598-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:7.47.0-1ubuntu2.7USN-3598-1

This Ubuntu release reached end-of-life on 2021-04-02.

libcurl3Ubuntu

Fixed in:7.35.0-1ubuntu2.15USN-3598-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:7.47.0-1ubuntu2.7USN-3598-1

This Ubuntu release reached end-of-life on 2021-04-02.

libcurl3-gnutlsUbuntu

Fixed in:7.35.0-1ubuntu2.15USN-3598-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:7.47.0-1ubuntu2.7USN-3598-1

This Ubuntu release reached end-of-life on 2021-04-02.

libcurl3-nssUbuntu

Fixed in:7.35.0-1ubuntu2.15USN-3598-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:7.47.0-1ubuntu2.7USN-3598-1

This Ubuntu release reached end-of-life on 2021-04-02.

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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 InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

9.21%probability of exploitation in 30 days

95thpercentile

Very high risk: more likely to be exploited than 95% of all known CVEs.

References

Patch3

Vendor Advisory1

curl.haxx.se

Third-Party Advisory9

Other references3

Related Vulnerabilities

Other CWE-476 (NULL Pointer Dereference) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-21758	High	7.5	93%	-	Fix
CVE-2023-21547	High	7.5	89%	-	Fix
CVE-2014-3470	Medium	4.3	86%	-	Fix
CVE-2021-44224	High	8.2	82%	-	Fix
CVE-2016-0742	High	7.5	82%	-	Fix
CVE-2009-1386	Medium	5.0	80%	-	Fix

Common questions

How do I fix CVE-2018-1000121?

Published advisories record a fix for 11 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-2018-1000121 being actively exploited?

Not that we know of. CVE-2018-1000121 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 9.2% is the estimated probability that it will be exploited in the next 30 days. That is higher than 95% of all scored CVEs.

How severe is CVE-2018-1000121?

CVE-2018-1000121 has a CVSS v3 base score of 7.5, rated high. 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-2018-1000121 affect?

Published advisories record a fix for curl (Amazon), curl-debuginfo (Amazon), libcurl (Amazon), libcurl-devel (Amazon), and 7 more. 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 2026-06-17.