CVE-2020-14021: An issue was discovered in Ozeki NG SMS Gateway through 4.17.6

Q: How do I fix CVE-2020-14021?

ozeki ng sms gateway: upgrade to newer than 4.17.6. Exact commands for each OS are on this page.

Q: Is CVE-2020-14021 being exploited?

CVE-2020-14021 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-14021 affect?

CVE-2020-14021 affects ozeki ng sms gateway. Severity is medium (CVSS 4.9). An issue was discovered in Ozeki NG SMS Gateway through 4.17.6. The ASP.net SMS module can be used to read and validate the source code of ASP files. By altering the path, it can be made to read any file on the Operating System, usually wit

Q: How urgent is CVE-2020-14021?

Priority 39/100. Public exploit reference

Routine

MEDIUM 4.9UPGRADE

CVE-2020-14021 is a medium-severity flaw (CVSS 4.9) affecting ozeki ng sms gateway. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in Ozeki NG SMS Gateway through 4.17.6. The ASP.net SMS module can be used to read and validate the source code of ASP files. By altering the path, it can be made to read any file on the Operating System, usually with NT AUTHORITY\SYSTEM privileges.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.9 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	1.1% (top 33%)
CISA exploited list	No
Published	2020-09-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ozeki

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-09-18 18:15 UTCPublished CVE record published
2026-06-17 02:54 UTCUpdated Record last modified

ozeki ozeki ng sms gateway UPGRADE

Affected: <= 4.17.6

Fixed in: newer than 4.17.6

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ozeki-ng-sms-gateway || rpm -q ozeki-ng-sms-gateway || ozeki-ng-sms-gateway --version

2. UPGRADE to newer than 4.17.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ozeki-ng-sms-gateway

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ozeki-ng-sms-gateway

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-14021?

ozeki ng sms gateway: upgrade to newer than 4.17.6. Exact commands for each OS are on this page.

Is CVE-2020-14021 being exploited?

CVE-2020-14021 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-14021 affect?

CVE-2020-14021 affects ozeki ng sms gateway. Severity is medium (CVSS 4.9). An issue was discovered in Ozeki NG SMS Gateway through 4.17.6. The ASP.net SMS module can be used to read and validate the source code of ASP files. By altering the path, it can be made to read any file on the Operating System, usually wit

How urgent is CVE-2020-14021?

Priority 39/100. Public exploit reference

Software pages

.NET vulnerabilities

Related CVEs

CVE-2020-14031 HIGH 7.2 UPGRADE An issue was discovered in Ozeki NG SMS Gateway through 4.17.6
CVE-2020-14030 HIGH 7.2 UPGRADE An issue was discovered in Ozeki NG SMS Gateway through 4.17.6
CVE-2020-14029 HIGH 7.5 UPGRADE An issue was discovered in Ozeki NG SMS Gateway through 4.17.6
CVE-2020-14028 HIGH 7.2 UPGRADE An issue was discovered in Ozeki NG SMS Gateway through 4.17.6
CVE-2020-14027 MEDIUM 5.3 UPGRADE An issue was discovered in Ozeki NG SMS Gateway through 4.17.6

References

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