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Vulnerability record · CVE-2021-20049 · published 23 December 2021

CVE-2021-20049: Sonicwall sma 100 firmware observable discrepancy vulnerability

Sonicwall · Sma 100 Firmware

A vulnerability in SonicWall SMA100 password change API allows a remote unauthenticated attacker to perform SMA100 username enumeration based on the server responses. This vulnerability impacts 10.2.1.2-24sv, 10.2.0.8-37sv and earlier 10.x versions.

7.5 CVSS 3.1 High EPSS 1.3% · top 29.7% CWE-204 · CWE-204CWE-203 · Observable discrepancy
7.5CVSS 3.1 base score, v2 5.0
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
6Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

A vulnerability in SonicWall SMA100 password change API allows a remote unauthenticated attacker to perform SMA100 username enumeration based on the server responses. This vulnerability impacts 10.2.1.2-24sv, 10.2.0.8-37sv and earlier 10.x versions.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

6 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0030 Vendor Advisory
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0030 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2021-20038SonicWall SMA 100 appliances stack buffer overflow in mod_cgiA stack-based buffer overflow in the Apache httpd mod_cgi module of SonicWall SMA 100 series appliances lets a remote unauthenticated attacker overwr…KEVEPSS 100%analysed9.8CVE-2021-20028SonicWall SRA appliances SQL injection in end-of-life firmwareSonicWall Secure Remote Access (SRA) appliances running all 8.x firmware and 9.0.0.9-26sv or earlier fail to neutralize SQL commands, allowing SQL in…KEVEPSS 30%analysed9.8CVE-2021-20016SonicWall SMA100 SSLVPN SQL injection allows unauthenticated accessSonicWall SSLVPN SMA100 firmware 10.x contains a SQL injection flaw in its SSLVPN interface. A remote attacker with no credentials can inject SQL to …KEVEPSS 40%analysed9.1CVE-2024-38475Apache HTTP Server mod_rewrite improper escaping enables code executionApache HTTP Server 2.4.59 and earlier has an improper output escaping flaw in mod_rewrite. Substitutions in server context that use a backreference o…KEVEPSS 100%analysed7.5CVE-2019-7483SonicWall SMA100 unauthenticated directory traversal in handleWAFRedirect CGISonicWall SMA100 firmware contains an unauthenticated directory traversal flaw in the handleWAFRedirect CGI. The description states the flaw lets a u…KEVEPSS 4.0%analysed7.5CVE-2019-7481SonicWall SMA100 SQL injection allows unauthenticated read accessSonicWall SMA100 firmware version 9.0.0.3 and earlier contains a SQL injection flaw (CWE-89) that lets an unauthenticated remote user read resources …KEVEPSS 100%analysed7.2CVE-2023-44221SonicWall SMA100 SSL-VPN management interface OS command injectionThe SMA100 SSL-VPN management interface fails to neutralize special elements, allowing command injection. A remote attacker who already holds adminis…KEVEPSS 76%analysed6.5CVE-2021-20035SonicWall SMA100 management interface OS command injectionThe SMA100 management interface fails to neutralize special elements, letting a remote authenticated attacker inject arbitrary commands that run as t…KEVEPSS 4.2%analysed

Source: NIST National Vulnerability Database (record CVE-2021-20049), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.