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CVE-2021-23017

HIGHCVSS 7.7/10EPSS 52.84%

Last modified

CVE-2021-23017 is a high-severity vulnerability rated 7.7/10 on the CVSS scale. A security issue in nginx resolver was identified, which might allow an attacker who is able to forge UDP packets from the DNS server to cause 1-byte memory overwrite, resulting in worker process crash or potential other impact.. EPSS estimates a 52.84% chance of exploitation in the next 30 days.

Description

A security issue in nginx resolver was identified, which might allow an attacker who is able to forge UDP packets from the DNS server to cause 1-byte memory overwrite, resulting in worker process crash or potential other impact.

Metrics

CVSS 3.1
7.7/10

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

EPSS Probability
52.84%

98.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
F5Nginx>= 0.6.18, < 1.20.1
OpenrestyOpenresty< 1.19.3.2
FedoraprojectFedora33
FedoraprojectFedora34
NetappOntap Select Deploy Administration UtilityAll versions
OracleBlockchain Platform< 21.1.2
OracleCommunications Control Plane Monitor3.4
OracleCommunications Control Plane Monitor4.2
OracleCommunications Control Plane Monitor4.3
OracleCommunications Control Plane Monitor4.4
OracleCommunications Fraud Monitor>= 3.4, <= 4.4
OracleCommunications Operations Monitor3.4
OracleCommunications Operations Monitor4.2
OracleCommunications Operations Monitor4.3
OracleCommunications Operations Monitor4.4
OracleCommunications Session Border Controller8.4
OracleCommunications Session Border Controller9.0
OracleEnterprise Communications Broker3.3.0
OracleEnterprise Session Border Controller8.4
OracleEnterprise Session Border Controller9.0
OracleEnterprise Telephony Fraud Monitor3.4
OracleEnterprise Telephony Fraud Monitor4.2
OracleEnterprise Telephony Fraud Monitor4.3
OracleEnterprise Telephony Fraud Monitor4.4
OracleGoldengate< 21.4.0.0.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-23017?
A security issue in nginx resolver was identified, which might allow an attacker who is able to forge UDP packets from the DNS server to cause 1-byte memory overwrite, resulting in worker process crash or potential other impact.
How severe is CVE-2021-23017?
CVE-2021-23017 has a CVSS score of 7.7/10 (HIGH severity). The EPSS model estimates a 52.84% probability of exploitation in the next 30 days.
How do I fix CVE-2021-23017?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-23017?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST