CVE-2021-21400 | Entering code in App Lock modal sends input to conversation

wire-webapp is an open-source front end for Wire, a secure collaboration platform. In wire-webapp before version 2021-03-15-production.0, when being prompted to enter the app-lock passphrase, the typed passphrase will be sent into the most recently used chat when the user does not actively give focus to the input field. Input element focus is enforced programatically in version 2021-03-15-production.0.

Published: 2021-04-02 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-21400 is rated Moderate Risk (50.7/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.12%). Review affected assets and schedule remediation.

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-2021-21400

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 2026-06-15 0.42% 1.12% +0.70%
2 2025-11-21 0.47% 0.42% -0.05%
3 2025-11-18 — 0.47% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-21400

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.1 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/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:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 4.2 [email protected]
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/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:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
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.
 2.8 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:N/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:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2021-21400

Affected software / configurations for CVE-2021-21400

Vendor Product Version Raw CPE
wire wire-webapp <= 2019-07-11-13-18 cpe:2.3:a:wire:wire-webapp:*:*:*:*:*:*:*:*
wire wire-webapp 2019-02-11 cpe:2.3:a:wire:wire-webapp:2019-02-11:staging0:*:*:*:*:*:*
wire wire-webapp 2019-02-11 cpe:2.3:a:wire:wire-webapp:2019-02-11:staging1:*:*:*:*:*:*
wire wire-webapp 2019-02-11 cpe:2.3:a:wire:wire-webapp:2019-02-11:staging2:*:*:*:*:*:*
wire wire-webapp 2019-02-13 cpe:2.3:a:wire:wire-webapp:2019-02-13:staging0:*:*:*:*:*:*
wire wire-webapp 2019-02-18 cpe:2.3:a:wire:wire-webapp:2019-02-18:staging0:*:*:*:*:*:*
wire wire-webapp 2019-02-27 cpe:2.3:a:wire:wire-webapp:2019-02-27:staging0:*:*:*:*:*:*
wire wire-webapp 2019-02-28 cpe:2.3:a:wire:wire-webapp:2019-02-28:staging0:*:*:*:*:*:*
wire wire-webapp 2019-02-28 cpe:2.3:a:wire:wire-webapp:2019-02-28:staging1:*:*:*:*:*:*
wire wire-webapp 2019-03-05 cpe:2.3:a:wire:wire-webapp:2019-03-05:staging0:*:*:*:*:*:*
wire wire-webapp 2019-03-07 cpe:2.3:a:wire:wire-webapp:2019-03-07:staging0:*:*:*:*:*:*
wire wire-webapp 2019-03-11 cpe:2.3:a:wire:wire-webapp:2019-03-11:staging0:*:*:*:*:*:*
wire wire-webapp 2019-03-13 cpe:2.3:a:wire:wire-webapp:2019-03-13:staging0:*:*:*:*:*:*
wire wire-webapp 2019-03-13 cpe:2.3:a:wire:wire-webapp:2019-03-13:staging1:*:*:*:*:*:*
wire wire-webapp 2019-03-20 cpe:2.3:a:wire:wire-webapp:2019-03-20:staging0:*:*:*:*:*:*
wire wire-webapp 2019-03-25 cpe:2.3:a:wire:wire-webapp:2019-03-25:staging0:*:*:*:*:*:*
wire wire-webapp 2019-03-25 cpe:2.3:a:wire:wire-webapp:2019-03-25:staging1:*:*:*:*:*:*
wire wire-webapp 2019-03-28 cpe:2.3:a:wire:wire-webapp:2019-03-28:staging0:*:*:*:*:*:*
wire wire-webapp 2019-03-28 cpe:2.3:a:wire:wire-webapp:2019-03-28:staging1:*:*:*:*:*:*
wire wire-webapp 2019-04-08 cpe:2.3:a:wire:wire-webapp:2019-04-08:staging0:*:*:*:*:*:*
wire wire-webapp 2019-04-11 cpe:2.3:a:wire:wire-webapp:2019-04-11:staging0:*:*:*:*:*:*
wire wire-webapp 2019-04-18 cpe:2.3:a:wire:wire-webapp:2019-04-18:staging0:*:*:*:*:*:*
wire wire-webapp 2019-04-23 cpe:2.3:a:wire:wire-webapp:2019-04-23:staging1:*:*:*:*:*:*
wire wire-webapp 2019-04-25 cpe:2.3:a:wire:wire-webapp:2019-04-25:staging0:*:*:*:*:*:*
wire wire-webapp 2019-04-29 cpe:2.3:a:wire:wire-webapp:2019-04-29:staging0:*:*:*:*:*:*
wire wire-webapp 2019-05-14 cpe:2.3:a:wire:wire-webapp:2019-05-14:staging0:*:*:*:*:*:*
wire wire-webapp 2019-05-15 cpe:2.3:a:wire:wire-webapp:2019-05-15:staging0:*:*:*:*:*:*
wire wire-webapp 2019-05-31 cpe:2.3:a:wire:wire-webapp:2019-05-31:staging0:*:*:*:*:*:*
wire wire-webapp 2019-06-04 cpe:2.3:a:wire:wire-webapp:2019-06-04:staging0:*:*:*:*:*:*
wire wire-webapp 2019-06-20 cpe:2.3:a:wire:wire-webapp:2019-06-20:staging0:*:*:*:*:*:*
wire wire-webapp 2019-06-24 cpe:2.3:a:wire:wire-webapp:2019-06-24:staging0:*:*:*:*:*:*
wire wire-webapp 2019-06-25 cpe:2.3:a:wire:wire-webapp:2019-06-25:staging0:*:*:*:*:*:*
wire wire-webapp 2019-06-26 cpe:2.3:a:wire:wire-webapp:2019-06-26:staging0:*:*:*:*:*:*
wire wire-webapp 2019-07-01 cpe:2.3:a:wire:wire-webapp:2019-07-01:staging0:*:*:*:*:*:*
wire wire-webapp 2019-07-30 cpe:2.3:a:wire:wire-webapp:2019-07-30:staging0:*:*:*:*:*:*
wire wire-webapp 2019-08-01 cpe:2.3:a:wire:wire-webapp:2019-08-01:staging0:*:*:*:*:*:*
wire wire-webapp 2019-08-14 cpe:2.3:a:wire:wire-webapp:2019-08-14:staging0:*:*:*:*:*:*
wire wire-webapp 2019-08-19 cpe:2.3:a:wire:wire-webapp:2019-08-19:staging0:*:*:*:*:*:*
wire wire-webapp 2019-08-21 cpe:2.3:a:wire:wire-webapp:2019-08-21:production0:*:*:*:*:*:*
wire wire-webapp 2019-08-22 cpe:2.3:a:wire:wire-webapp:2019-08-22:production0:*:*:*:*:*:*
wire wire-webapp 2019-08-22 cpe:2.3:a:wire:wire-webapp:2019-08-22:staging0:*:*:*:*:*:*
wire wire-webapp 2019-08-27 cpe:2.3:a:wire:wire-webapp:2019-08-27:staging0:*:*:*:*:*:*
wire wire-webapp 2019-09-02 cpe:2.3:a:wire:wire-webapp:2019-09-02:production0:*:*:*:*:*:*
wire wire-webapp 2019-09-05 cpe:2.3:a:wire:wire-webapp:2019-09-05:staging0:*:*:*:*:*:*
wire wire-webapp 2019-09-09 cpe:2.3:a:wire:wire-webapp:2019-09-09:staging0:*:*:*:*:*:*
wire wire-webapp 2019-09-12 cpe:2.3:a:wire:wire-webapp:2019-09-12:staging0:*:*:*:*:*:*
wire wire-webapp 2019-09-13 cpe:2.3:a:wire:wire-webapp:2019-09-13:staging0:*:*:*:*:*:*
wire wire-webapp 2019-09-17 cpe:2.3:a:wire:wire-webapp:2019-09-17:production0:*:*:*:*:*:*
wire wire-webapp 2019-09-18 cpe:2.3:a:wire:wire-webapp:2019-09-18:staging0:*:*:*:*:*:*
wire wire-webapp 2019-09-23 cpe:2.3:a:wire:wire-webapp:2019-09-23:staging0:*:*:*:*:*:*
wire wire-webapp 2019-09-24 cpe:2.3:a:wire:wire-webapp:2019-09-24:production0:*:*:*:*:*:*
wire wire-webapp 2019-10-07 cpe:2.3:a:wire:wire-webapp:2019-10-07:staging0:*:*:*:*:*:*
wire wire-webapp 2019-10-07 cpe:2.3:a:wire:wire-webapp:2019-10-07:staging1:*:*:*:*:*:*
wire wire-webapp 2019-10-08 cpe:2.3:a:wire:wire-webapp:2019-10-08:staging0:*:*:*:*:*:*
wire wire-webapp 2019-10-10 cpe:2.3:a:wire:wire-webapp:2019-10-10:staging0:*:*:*:*:*:*
wire wire-webapp 2019-10-10 cpe:2.3:a:wire:wire-webapp:2019-10-10:staging1:*:*:*:*:*:*
wire wire-webapp 2019-10-14 cpe:2.3:a:wire:wire-webapp:2019-10-14:staging0:*:*:*:*:*:*
wire wire-webapp 2019-10-16 cpe:2.3:a:wire:wire-webapp:2019-10-16:production0:*:*:*:*:*:*
wire wire-webapp 2019-10-16 cpe:2.3:a:wire:wire-webapp:2019-10-16:production1:*:*:*:*:*:*
wire wire-webapp 2019-10-16 cpe:2.3:a:wire:wire-webapp:2019-10-16:staging0:*:*:*:*:*:*
wire wire-webapp 2019-10-16 cpe:2.3:a:wire:wire-webapp:2019-10-16:staging1:*:*:*:*:*:*
wire wire-webapp 2019-10-21 cpe:2.3:a:wire:wire-webapp:2019-10-21:staging0:*:*:*:*:*:*
wire wire-webapp 2019-10-25 cpe:2.3:a:wire:wire-webapp:2019-10-25:staging0:*:*:*:*:*:*
wire wire-webapp 2019-10-29 cpe:2.3:a:wire:wire-webapp:2019-10-29:staging0:*:*:*:*:*:*
wire wire-webapp 2019-10-31 cpe:2.3:a:wire:wire-webapp:2019-10-31:staging0:*:*:*:*:*:*
wire wire-webapp 2019-11-01 cpe:2.3:a:wire:wire-webapp:2019-11-01:production0:*:*:*:*:*:*
wire wire-webapp 2019-11-08 cpe:2.3:a:wire:wire-webapp:2019-11-08:staging0:*:*:*:*:*:*
wire wire-webapp 2019-11-12 cpe:2.3:a:wire:wire-webapp:2019-11-12:staging0:*:*:*:*:*:*
wire wire-webapp 2019-11-19 cpe:2.3:a:wire:wire-webapp:2019-11-19:staging0:*:*:*:*:*:*
wire wire-webapp 2019-11-21 cpe:2.3:a:wire:wire-webapp:2019-11-21:production0:*:*:*:*:*:*
wire wire-webapp 2019-11-21 cpe:2.3:a:wire:wire-webapp:2019-11-21:staging0:*:*:*:*:*:*
wire wire-webapp 2019-11-25 cpe:2.3:a:wire:wire-webapp:2019-11-25:staging0:*:*:*:*:*:*
wire wire-webapp 2019-11-26 cpe:2.3:a:wire:wire-webapp:2019-11-26:production0:*:*:*:*:*:*
wire wire-webapp 2019-12-12 cpe:2.3:a:wire:wire-webapp:2019-12-12:staging0:*:*:*:*:*:*
wire wire-webapp 2019-12-20 cpe:2.3:a:wire:wire-webapp:2019-12-20:staging0:*:*:*:*:*:*
wire wire-webapp 2020-01-06 cpe:2.3:a:wire:wire-webapp:2020-01-06:production0:*:*:*:*:*:*
wire wire-webapp 2020-01-09 cpe:2.3:a:wire:wire-webapp:2020-01-09:staging0:*:*:*:*:*:*
wire wire-webapp 2020-01-13 cpe:2.3:a:wire:wire-webapp:2020-01-13:production0:*:*:*:*:*:*
wire wire-webapp 2020-01-15 cpe:2.3:a:wire:wire-webapp:2020-01-15:staging0:*:*:*:*:*:*
wire wire-webapp 2020-01-16 cpe:2.3:a:wire:wire-webapp:2020-01-16:staging0:*:*:*:*:*:*

References for CVE-2021-21400

cvelogic Threat Intelligence