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CVE-2021-2351

28
FAUCET Score

CVE-2021-2351 is a difficult-to-exploit vulnerability in the Advanced Networking Option component of Oracle Database Server versions 12.1.0.2, 12.2.0.1, and 19c. An unauthenticated attacker with network access via Oracle Net can compromise the Advanced Networking Option, requiring human interaction for successful exploitation. This vulnerability carries a high CVSS 3.1 score of 8.3, indicating significant impacts on confidentiality, integrity, and availability, potentially leading to a full takeover of the Advanced Networking Option and affecting additional products. While there is no known active exploitation or public exploit code, the vulnerability has garnered community discussion, including a proof-of-concept video demonstrating its potential. Oracle addressed this issue in the July 2021 Critical Patch Update with changes to Native Network Encryption.

Impacted Technologies

VendorProductVersion(s)CPE
12.1.0.2CPE matchmatch criteria
cpe:2.3:a:oracle:advanced_networking_option:12.1.0.2:*:*:*:*:*:*:*
12.2.0.1CPE matchmatch criteria
cpe:2.3:a:oracle:advanced_networking_option:12.2.0.1:*:*:*:*:*:*:*
19cCPE matchmatch criteria
cpe:2.3:a:oracle:advanced_networking_option:19c:*:*:*:*:*:*:*
6.2.1.0CPE matchmatch criteria
cpe:2.3:a:oracle:agile_engineering_data_management:6.2.1.0:*:*:*:*:*:*:*
9.3.6CPE matchmatch criteria
cpe:2.3:a:oracle:agile_plm:9.3.6:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.3HIGH

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.6
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.50%
Probability of exploitation in next 30 days
EPSS Percentile
83.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0250 is in the 54th percentile among its peer group of 1,572 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.4 Bluesky, 0.2 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.6 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

oraclepatch availablevia nvd_reference
View patch

References

packetstormsecurity.com / files/165255/Oracle-Database-Protection-Mechanism-Bypass.html
ExploitThird Party AdvisoryVDB Entry
packetstormsecurity.com / files/165258/Oracle-Database-Weak-NNE-Integrity-Key-Derivation.html
ExploitThird Party AdvisoryVDB Entry
seclists.org / fulldisclosure/2021/Dec/19
ExploitMailing ListThird Party Advisory
seclists.org / fulldisclosure/2021/Dec/20
ExploitMailing ListThird Party Advisory
oracle.com / security-alerts/cpuapr2022.html
PatchVendor Advisory
oracle.com / security-alerts/cpujan2022.html
PatchVendor Advisory
oracle.com / security-alerts/cpujan2023.html
Vendor Advisory
oracle.com / security-alerts/cpujul2021.html
PatchVendor Advisory
oracle.com / security-alerts/cpujul2022.html
Vendor Advisory
oracle.com / security-alerts/cpuoct2021.html
PatchVendor Advisory