High severity · published Jun 1, 2021
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…
7.7
CVSS
53.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)53.5% · higher than 99% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BP
Blockchain Platform · Oracle
before 21.1.2 · source: NVD
CC
Communications Control Plane Monitor · Oracle
3.4; 4.2; 4.3; 4.4 · source: NVD
CF
Communications Fraud Monitor · Oracle
3.4 through 4.4 · source: NVD
CO
Communications Operations Monitor · Oracle
3.4; 4.2; 4.3; 4.4 · source: NVD
CS
Communications Session Border Controller · Oracle
8.4; 9.0 · source: NVD
EC
Enterprise Communications Broker · Oracle
3.3.0 · source: NVD
ES
Enterprise Session Border Controller · Oracle
8.4; 9.0 · source: NVD
ET
Enterprise Telephony Fraud Monitor · Oracle
3.4; 4.2; 4.3; 4.4 · source: NVD
FE
Fedora · Fedoraproject
33; 34 · source: NVD
GO
Goldengate · Oracle
before 21.4.0.0.0 · source: NVD
NG
Nginx · F5
0.6.18 before 1.20.1 · source: NVD
OS
Ontap Select Deploy Administration Utility · Netapp
All versions, or not specified · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-23017
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-23017
Mailing List
http://mailman.nginx.org/pipermail/nginx-announce/2021/000300.html
Third Party Advisory
http://packetstormsecurity.com/files/167720/Nginx-1.20.0-Denial-Of-Service.html
lists.apache.org
https://lists.apache.org/thread.html/r37e6b2165f7c910d8e15fd54f4697857619ad2625f56583802004009%40%3Cnotifications.apisix.apache.org%3E
lists.apache.org
https://lists.apache.org/thread.html/r4d4966221ca399ce948ef34884652265729d7d9ef8179c78d7f17e7f%40%3Cnotifications.apisix.apache.org%3E
lists.apache.org
https://lists.apache.org/thread.html/r6fc5c57b38e93e36213e9a18c8a4e5dbd5ced1c7e57f08a1735975ba%40%3Cnotifications.apisix.apache.org%3E
lists.apache.org
https://lists.apache.org/thread.html/rf232eecd47fdc44520192810560303073cefd684b321f85e311bad31%40%3Cnotifications.apisix.apache.org%3E
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