urllib3 up to 1.25.8 putrequest crlf injection

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.8$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in urllib3 up to 1.25.8. This affects the function putrequest. The manipulation leads to crlf injection. This vulnerability is documented as CVE-2020-26137. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in urllib3 up to 1.25.8 and classified as critical. This issue affects the function putrequest. The manipulation with an unknown input leads to a crlf injection vulnerability. Using CWE to declare the problem leads to CWE-93. The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

urllib3 before 1.25.9 allows CRLF injection if the attacker controls the HTTP request method, as demonstrated by inserting CR and LF control characters in the first argument of putrequest(). NOTE: this is similar to CVE-2020-26116.

The weakness was released 09/30/2020. The identification of this vulnerability is CVE-2020-26137 since 09/29/2020. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 236633 (Alibaba Cloud Linux 3 : 0112: python27:2.7 (ALINUX3-SA-2022:0112)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.25.9 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (236633). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.8

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Crlf injection
CWE: CWE-93 / CWE-74 / CWE-707
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 236633
Nessus Name: Alibaba Cloud Linux 3 : 0112: python27:2.7 (ALINUX3-SA-2022:0112)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: urllib3 1.25.9

Timelineinfo

09/29/2020 🔍
09/30/2020 +1 days 🔍
10/01/2020 +1 days 🔍
05/19/2025 +1691 days 🔍

Sourcesinfo

Status: Confirmed

CVE: CVE-2020-26137 (🔍)
GCVE (CVE): GCVE-0-2020-26137
GCVE (VulDB): GCVE-100-162131

Entryinfo

Created: 10/01/2020 09:54
Updated: 05/19/2025 19:40
Changes: 10/01/2020 09:54 (35), 10/01/2020 09:59 (3), 11/14/2020 09:33 (5), 11/15/2020 10:04 (14), 05/19/2025 19:40 (19)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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