Vulnerability identifier: #VU51589

Vulnerability risk: Low

CVSSv3.1: 2.7 [CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-20677

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
UNIVERGE Aspire WX
Server applications / Conferencing, Collaboration and VoIP solutions
UNIVERGE Aspire UX
Server applications / Conferencing, Collaboration and VoIP solutions
UNIVERGE SV9100
Server applications / Conferencing, Collaboration and VoIP solutions
SL2100
Server applications / Conferencing, Collaboration and VoIP solutions

Vendor: NEC Corporation

Description

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

The vulnerability exists due to insufficient validation of user-supplied input in remote system maintenance feature. A remote authenticated attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

UNIVERGE Aspire WX: 1.00 - 3.51

UNIVERGE Aspire UX: 1.00 - 9.70

UNIVERGE SV9100: 1.00 - 10.70

SL2100: 1.00 - 3.00

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External links
http://jvn.jp/en/jp/JVN12737530/index.html
http://www.necplatforms.co.jp/press/files/SVSLSecurityAdvisoryR1.0_20210322.pdf

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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