CVE-2021-27075 [Medium] | Information Disclosure in Azure Container Instances

CVE-2021-27075 is rated Moderate Risk (51.7/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.34%). Review affected assets and schedule remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.48%	1.34%	+0.86%
2	2025-11-21	0.35%	0.48%	+0.13%
3	2025-11-18	—	0.35%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.48%

1.34%

+0.86%

2025-11-21

0.35%

0.48%

+0.13%

2025-11-18

—

0.35%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.8	3.1	MEDIUM	`CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N` Click to expand Attack vector (AV:A) Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. 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:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:N) Service keeps running; no real outage angle.	2.3	4.0	[email protected]
6.8	3.1	MEDIUM	`CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N` Click to expand Attack vector (AV:A) Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. 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:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:N) Service keeps running; no real outage angle.	2.3	4.0	[email protected]
2.7	2.0	LOW	`AV:A/AC:L/Au:S/C:P/I:N/A:N` Click to expand Access vector (AV:A) Requires access to an adjacent network segment. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:S) A single authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:N) No integrity impact. Availability impact (A:N) No availability impact.	5.1	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.8

3.1

MEDIUM

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

Attack vector (AV:A): Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
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:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:N): Service keeps running; no real outage angle.

2.3

4.0

[email protected]

6.8

3.1

MEDIUM

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

Attack vector (AV:A): Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
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:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:N): Service keeps running; no real outage angle.

2.3

4.0

[email protected]

2.7

2.0

LOW

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

Access vector (AV:A): Requires access to an adjacent network segment.
Access complexity (AC:L): Exploitation conditions are straightforward and predictable.
Authentication (AU:S): A single authentication is required.
Confidentiality impact (C:P): Partial confidentiality impact.
Integrity impact (I:N): No integrity impact.
Availability impact (A:N): No availability impact.

5.1

2.9

[email protected]

Affected software / configurations for CVE-2021-27075

Vendor	Product	Version	Raw CPE
microsoft	azure_container_instances	—	cpe:2.3:a:microsoft:azure_container_instances:-:::::::*
microsoft	azure_container_registry	—	cpe:2.3:a:microsoft:azure_container_registry:-:::::::*
microsoft	azure_kubernetes_service	—	cpe:2.3:a:microsoft:azure_kubernetes_service:-:::::::*
microsoft	azure_service_fabric	—	cpe:2.3:a:microsoft:azure_service_fabric:-:::::::*
microsoft	azure_spring_cloud	—	cpe:2.3:a:microsoft:azure_spring_cloud:-:::::::*

References for CVE-2021-27075

URL	Tags
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-27075	Patch Vendor Advisory

URL

CVE-2021-27075 | Azure Virtual Machine Information Disclosure Vulnerability

Exploit prediction scoring system (EPSS) score for CVE-2021-27075

Common vulnerability scoring system (CVSS) metrics for CVE-2021-27075

Weakness enumeration for CVE-2021-27075

Affected software / configurations for CVE-2021-27075

References for CVE-2021-27075