CVE-2020-8920 | Overoptimization leads to private information leak in Gerrit

An information leak vulnerability exists in Gerrit versions prior to 2.14.22, 2.15.21, 2.16.25, 3.0.15, 3.1.10, 3.2.5 where an overoptimization with the FilteredRepository wrapper skips the verification of access on All-Users repositories, allowing an attacker to get read access to all users' personal information associated with their accounts.

Published: 2020-12-10 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-8920 is rated Low Risk (21.1/100): CVSS Low severity, with low exploitation likelihood (EPSS 0.08%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-8920

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-03-17 0.05% 0.08% +0.03%
2 2024-12-17 0.06% 0.05% -0.02%
3 2023-03-07 — 0.06% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-8920

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
3.5 3.1 LOW
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/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: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:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.1 1.4 [email protected]
3.5 3.1 LOW
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/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: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:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.1 1.4 [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]

Weakness enumeration for CVE-2020-8920

GitHub Security Advisory for CVE-2020-8920

Affected software / configurations for CVE-2020-8920

Vendor Product Version Raw CPE
google gerrit >= 2.14.0, < 2.14.22 cpe:2.3:a:google:gerrit:*:*:*:*:*:*:*:*
google gerrit >= 2.15.0, < 2.15.21 cpe:2.3:a:google:gerrit:*:*:*:*:*:*:*:*
google gerrit >= 2.16.0, < 2.16.25 cpe:2.3:a:google:gerrit:*:*:*:*:*:*:*:*
google gerrit >= 3.0.0, < 3.0.15 cpe:2.3:a:google:gerrit:*:*:*:*:*:*:*:*
google gerrit >= 3.1.0, < 3.1.10 cpe:2.3:a:google:gerrit:*:*:*:*:*:*:*:*
google gerrit >= 3.2.0, < 3.2.5 cpe:2.3:a:google:gerrit:*:*:*:*:*:*:*:*

References for CVE-2020-8920

cvelogic Threat Intelligence