CVE-2021-36100 | Authenticated remote code execution

Specially crafted string in OTRS system configuration can allow the execution of any system command.

Published: 2022-03-21 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-36100 is rated Moderate Risk (49.5/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.30%). 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-2021-36100

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 0.72% 1.30% +0.58%
2 2026-04-01 0.97% 0.72% -0.26%
3 2026-03-04 — 0.97% —

Full EPSS history (16 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-36100

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.4 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H 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:H)
They need powerful rights—admin, root, or similar—before this pays off.
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:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 0.5 5.9 [email protected]
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H 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: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:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
9.0 2.0 HIGH
AV:N/AC:L/Au:S/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.0 10.0 [email protected]

Weakness enumeration for CVE-2021-36100

OS Trackers for CVE-2021-36100

vendor priority summary link
debian unimportant CVE-2021-36100 unimportant priority: Debian including 2 source packages (otrs2, znuny), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 4, open 1. https://security-tracker.debian.org/tracker/CVE-2021-36100
ubuntu medium CVE-2021-36100 medium priority: Ubuntu including 2 source packages (otrs2, znuny), 26 status rows across 13 suites (bionic, focal, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 12, ignored 6, needs-triage 6, not-affected 1, released 1. https://ubuntu.com/security/CVE-2021-36100

Affected software / configurations for CVE-2021-36100

Vendor Product Version Raw CPE
otrs otrs < 7.0.28 cpe:2.3:a:otrs:otrs:*:*:*:*:*:*:*:*
otrs otrs >= 7.0.30, < 7.0.33 cpe:2.3:a:otrs:otrs:*:*:*:*:*:*:*:*
otrs otrs >= 8.0.0, < 8.0.21 cpe:2.3:a:otrs:otrs:*:*:*:*:*:*:*:*
otrs otrs_itsm < 7.0.19 cpe:2.3:a:otrs:otrs_itsm:*:*:*:*:*:*:*:*
otrs otrs_itsm >= 8.0.0, < 8.0.28 cpe:2.3:a:otrs:otrs_itsm:*:*:*:*:*:*:*:*
otrs otrs_storm < 8.0.12 cpe:2.3:a:otrs:otrs_storm:*:*:*:*:*:*:*:*

References for CVE-2021-36100

cvelogic Threat Intelligence