CVE-2016-0818 [Medium] | Spoofing in Android

The caching functionality in the TrustManagerImpl class in TrustManagerImpl.java in Conscrypt in Android 4.x before 4.4.4, 5.x before 5.1.1 LMY49H, and 6.x before 2016-03-01 mishandles the distinction between an intermediate CA and a trusted root CA, which allows man-in-the-middle attackers to spoof servers by leveraging access to an intermediate CA to issue a certificate, aka internal bug 26232830.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.10%	0.27%	+0.17%
2	2023-03-07	1.02%	0.10%	-0.92%
3	2022-02-04	—	1.02%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.10%

0.27%

+0.17%

2023-03-07

1.02%

0.10%

-0.92%

2022-02-04

—

1.02%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.9	3.0	MEDIUM	`CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N` 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:N) No account or special rights needed—anonymous or random user is enough. 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:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:N) Service keeps running; no real outage angle.	2.2	3.6	[email protected]
4.3	2.0	MEDIUM	`AV:N/AC:M/Au:N/C:N/I:P/A:N` 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:N) No authentication is required. Confidentiality impact (C:N) No confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:N) No availability impact.	8.6	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

5.9

3.0

MEDIUM

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N 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:N): No account or special rights needed—anonymous or random user is enough.
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:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N): Service keeps running; no real outage angle.

2.2

3.6

[email protected]

4.3

2.0

MEDIUM

AV:N/AC:M/Au:N/C:N/I:P/A:N 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:N): No authentication is required.
Confidentiality impact (C:N): No confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:N): No availability impact.

8.6

2.9

[email protected]

OS Trackers for CVE-2016-0818

vendor	priority	summary	link
`ubuntu`	low	CVE-2016-0818 low priority: Ubuntu including 1 source packages (android), 9 status rows across 9 suites (artful, bionic, precise, trusty, upstream, wily, xenial, yakkety, zesty): DNE 4, released 3, ignored 1, needs-triage 1.	https://ubuntu.com/security/CVE-2016-0818

Affected software / configurations for CVE-2016-0818

Vendor	Product	Version	Raw CPE
google	android	4.0	cpe:2.3:o:google:android:4.0:::::::*
google	android	4.0.1	cpe:2.3:o:google:android:4.0.1:::::::*
google	android	4.0.2	cpe:2.3:o:google:android:4.0.2:::::::*
google	android	4.0.3	cpe:2.3:o:google:android:4.0.3:::::::*
google	android	4.0.4	cpe:2.3:o:google:android:4.0.4:::::::*
google	android	4.1	cpe:2.3:o:google:android:4.1:::::::*
google	android	4.1.2	cpe:2.3:o:google:android:4.1.2:::::::*
google	android	4.2	cpe:2.3:o:google:android:4.2:::::::*
google	android	4.2.1	cpe:2.3:o:google:android:4.2.1:::::::*
google	android	4.2.2	cpe:2.3:o:google:android:4.2.2:::::::*
google	android	4.3	cpe:2.3:o:google:android:4.3:::::::*
google	android	4.3.1	cpe:2.3:o:google:android:4.3.1:::::::*
google	android	4.4	cpe:2.3:o:google:android:4.4:::::::*
google	android	4.4.1	cpe:2.3:o:google:android:4.4.1:::::::*
google	android	4.4.2	cpe:2.3:o:google:android:4.4.2:::::::*
google	android	4.4.3	cpe:2.3:o:google:android:4.4.3:::::::*
google	android	5.0	cpe:2.3:o:google:android:5.0:::::::*
google	android	5.0.1	cpe:2.3:o:google:android:5.0.1:::::::*
google	android	5.0.2	cpe:2.3:o:google:android:5.0.2:::::::*
google	android	5.1	cpe:2.3:o:google:android:5.1:::::::*
google	android	5.1.0	cpe:2.3:o:google:android:5.1.0:::::::*
google	android	5.1.1	cpe:2.3:o:google:android:5.1.1:::::::*
google	android	6.0	cpe:2.3:o:google:android:6.0:::::::*
google	android	6.0.1	cpe:2.3:o:google:android:6.0.1:::::::*

References for CVE-2016-0818

URL	Tags
http://source.android.com/security/bulletin/2016-03-01.html	Vendor Advisory
http://www.securityfocus.com/bid/84245
https://android.googlesource.com/platform/external/conscrypt/+/4c9f9c2201116acf790fca25af43995d29980ee0
https://android.googlesource.com/platform/external/conscrypt/+/c4ab1b959280413fb11bf4fd7f6b4c2ba38bd779

URL

CVE-2016-0818

Exploit prediction scoring system (EPSS) score for CVE-2016-0818

Common vulnerability scoring system (CVSS) metrics for CVE-2016-0818

Weakness enumeration for CVE-2016-0818

OS Trackers for CVE-2016-0818

Affected software / configurations for CVE-2016-0818

References for CVE-2016-0818