cURL up to 7.x Telnet Protocol special elements into a different plane (special element injection)

CVSS Meta Temp Score
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CTI Interest Score
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8.0$0-$5k0.00

Summaryinfo

A vulnerability was found in cURL up to 7.x. It has been rated as problematic. This impacts an unknown function of the component Telnet Protocol Handler. The manipulation leads to failure to sanitize special elements into a different plane (special element injection). This vulnerability is documented as CVE-2023-27533. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in cURL up to 7.x (Network Utility Software). This issue affects an unknown function of the component Telnet Protocol Handler. The manipulation with an unknown input leads to a failure to sanitize special elements into a different plane (special element injection) vulnerability. Using CWE to declare the problem leads to CWE-75. The product does not adequately filter user-controlled input for special elements with control implications. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A vulnerability in input validation exists in curl <8.0 during communication using the TELNET protocol may allow an attacker to pass on maliciously crafted user name and "telnet options" during server negotiation. The lack of proper input scrubbing allows an attacker to send content or perform option negotiation without the application's intent. This vulnerability could be exploited if an application allows user input, thereby enabling attackers to execute arbitrary code on the system.

The weakness was released 03/31/2023. It is possible to read the advisory at hackerone.com. The identification of this vulnerability is CVE-2023-27533 since 03/02/2023. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 215959 (Azure Linux 3.0 Security Update: cmake / curl / mysql / rust / tensorflow (CVE-2023-27533)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 8.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (215959). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 8.0

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔍

ADP CISA Base Score: 9.8
ADP CISA Vector: 🔍

CVSSv2info

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

Exploitinginfo

Class: Failure to sanitize special elements into a different plane (special element injection)
CWE: CWE-75 / CWE-707 / CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 215959
Nessus Name: Azure Linux 3.0 Security Update: cmake / curl / mysql / rust / tensorflow (CVE-2023-27533)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: cURL 8.0

Timelineinfo

03/02/2023 🔍
03/31/2023 +28 days 🔍
03/31/2023 +0 days 🔍
02/13/2026 +1050 days 🔍

Sourcesinfo

Advisory: FEDORA-2023-7e7414e64d
Status: Confirmed

CVE: CVE-2023-27533 (🔍)
GCVE (CVE): GCVE-0-2023-27533
GCVE (VulDB): GCVE-100-224651

Entryinfo

Created: 03/31/2023 09:11
Updated: 02/13/2026 23:05
Changes: 03/31/2023 09:11 (39), 04/20/2023 19:36 (1), 04/20/2023 19:44 (11), 02/11/2025 06:32 (16), 02/13/2026 23:05 (11)
Complete: 🔍
Cache ID: 216::103

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

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