CVE-2020-2515 [Medium] | Denial of Service in Database Server

Vulnerability in the Database Gateway for ODBC component of Oracle Database Server. Supported versions that are affected are 11.2.0.4, 12.1.0.2, 12.2.0.1, 18c and 19c. Difficult to exploit vulnerability allows low privileged attacker having Create Session privilege with network access via OracleNet to compromise Database Gateway for ODBC. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Database Gateway for ODBC accessible data as well as unauthorized read access to a subset of Database Gateway for ODBC accessible data and unauthorized ability to cause a partial denial of service (partial DOS) of Database Gateway for ODBC. CVSS 3.0 Base Score 5.0 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L).

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.35%	0.79%	+0.44%
2	2025-11-21	0.27%	0.35%	+0.08%
3	2025-11-18	—	0.27%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.35%

0.79%

+0.44%

2025-11-21

0.27%

0.35%

+0.08%

2025-11-18

—

0.27%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.0	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.	1.6	3.4	[email protected]
5.0	3.0	MEDIUM	`CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.	1.6	3.4	[email protected]
6.0	2.0	MEDIUM	`AV:N/AC:M/Au:S/C:P/I:P/A:P` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:M) Exploitation needs some favorable conditions, but not exceptional ones. Authentication (AU:S) A single authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:P) Partial availability impact.	6.8	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

5.0

3.1

MEDIUM

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

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L): Some sensitive info could get out, but not a total data dump.
Integrity (I:L): Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L): Might cause slowdowns, glitches, or partial disruption—not a full brick.

1.6

3.4

[email protected]

5.0

3.0

MEDIUM

CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L): Some sensitive info could get out, but not a total data dump.
Integrity (I:L): Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L): Might cause slowdowns, glitches, or partial disruption—not a full brick.

1.6

3.4

[email protected]

6.0

2.0

MEDIUM

AV:N/AC:M/Au:S/C:P/I:P/A:P Click to expand

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:M): Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:S): A single authentication is required.
Confidentiality impact (C:P): Partial confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:P): Partial availability impact.

6.8

6.4

[email protected]

Affected software / configurations for CVE-2020-2515

Vendor	Product	Version	Raw CPE
oracle	database_server	11.2.0.4	cpe:2.3:a:oracle:database_server:11.2.0.4:::::::*
oracle	database_server	12.1.0.2	cpe:2.3:a:oracle:database_server:12.1.0.2:::::::*
oracle	database_server	12.2.0.1	cpe:2.3:a:oracle:database_server:12.2.0.1:::::::*
oracle	database_server	18c	cpe:2.3:a:oracle:database_server:18c:::::::*
oracle	database_server	19c	cpe:2.3:a:oracle:database_server:19c:::::::*

References for CVE-2020-2515

URL	Tags
https://www.oracle.com/security-alerts/cpujan2020.html	Patch Vendor Advisory

URL

CVE-2020-2515

Exploit prediction scoring system (EPSS) score for CVE-2020-2515

Common vulnerability scoring system (CVSS) metrics for CVE-2020-2515

Weakness enumeration for CVE-2020-2515

Affected software / configurations for CVE-2020-2515

References for CVE-2020-2515