Vulnerability identifier: #VU6841

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-7502

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Mozilla NSS
Universal components / Libraries / Libraries used by multiple products

Vendor: Mozilla

Description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to NULL pointer dereference error in NSS since 3.24.0 when processing empty SSLv2 messages, received from clients. A remote attacker can send specially crafted request to vulnerable service and perform denial of service attack.

Mitigation
Install update from vendor's repository.

Vulnerable software versions

Mozilla NSS: 3.24 - 3.30.2

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External links
http://hg.mozilla.org/projects/nss/rev/55ea60effd0d

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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.