#VU57427 HTTP response splitting in MF971R - CVE-2021-21743

Vulnerability identifier: #VU57427

Vulnerability risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-21743

CWE-ID: CWE-113

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
MF971R
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: ZTE

Description

The vulnerability allows a remote attacker to perform HTTP splitting attacks.

The vulnerability exists due to software does not corrector process CRLF character sequences. A remote attacker can send specially crafted request containing CRLF sequence and make the application to send a split HTTP response.

Successful exploitation of the vulnerability may allow an attacker perform cache poisoning attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

MF971R: All versions

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External links
https://www.talosintelligence.com/vulnerability_reports/TALOS-2021-1313

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.