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CVE-2020-15693 Details

Description

In Nim 1.2.4, the standard library httpClient is vulnerable to a CR-LF injection in the target URL. An injection is possible if the attacker controls any part of the URL provided in a call (such as httpClient.get or httpClient.post), the User-Agent header value, or custom HTTP header names or values.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://consensys.net/diligence/vulnerabilities/nim-httpclient-header-crlf-injection/	CVE	ExploitThird Party Advisory
https://github.com/nim-lang/Nim/blob/dc5a40f3f39c6ea672e6dc6aca7f8118a69dda99/lib/pure/httpclient.nim#L1023	CVE	PatchThird Party Advisory
https://nim-lang.org/blog/2020/07/30/versions-126-and-108-released.html	CVE	Release NotesThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/02/04/2	CVE	ExploitMailing ListThird Party Advisory
https://consensys.net/diligence/vulnerabilities/nim-httpclient-header-crlf-injection/	[email protected]	ExploitThird Party Advisory
https://github.com/nim-lang/Nim/blob/dc5a40f3f39c6ea672e6dc6aca7f8118a69dda99/lib/pure/httpclient.nim#L1023	[email protected]	PatchThird Party Advisory
https://nim-lang.org/blog/2020/07/30/versions-126-and-108-released.html	[email protected]	Release NotesThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/02/04/2	[email protected]	ExploitMailing ListThird Party Advisory

see all 8 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-74	Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')	[email protected]

Affected Products

Product	Versions
nim-lang nim	<= 1.2.6
CPE cpe:2.3:a:nim-lang:nim:::::::: Remediation No remediation found in references.

Change History

7 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Feb 8, 2021	Modified Analysis	[email protected]
Feb 4, 2021	CVE Modified	[email protected]
Feb 4, 2021	CVE Modified	[email protected]
Aug 20, 2020	Initial Analysis	[email protected]