CVE-2021-34587 | Bender Charge Controller: Long URL could lead to webserver crash

In Bender/ebee Charge Controllers in multiple versions a long URL could lead to webserver crash. The URL is used as input of an sprintf to a stack variable.

Published: 2022-04-27 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-34587 is rated Low Risk (39.3/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.29%). 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-2021-34587

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 2025-05-25 0.40% 0.29% -0.11%
2 2025-05-04 0.04% 0.40% +0.36%
3 2025-03-30 — 0.04% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-34587

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L 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: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:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 3.9 1.4 [email protected]
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L 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: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:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 3.9 1.4 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P 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:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2021-34587

Affected software / configurations for CVE-2021-34587

Vendor Product Version Raw CPE
ibm _ibm_rational_lifecycle_integration_adapter_for_windchill 1.0.0 cpe:2.3:a:ibm:_ibm_rational_lifecycle_integration_adapter_for_windchill:1.0.0:*:*:*:*:*:*:*
bender cc612_firmware >= 5.11.0, < 5.11.2 cpe:2.3:o:bender:cc612_firmware:*:*:*:*:*:*:*:*
bender cc612_firmware >= 5.12.0, < 5.12.5 cpe:2.3:o:bender:cc612_firmware:*:*:*:*:*:*:*:*
bender cc612_firmware >= 5.13.0, < 5.13.2 cpe:2.3:o:bender:cc612_firmware:*:*:*:*:*:*:*:*
bender cc612_firmware >= 5.20.0, < 5.20.2 cpe:2.3:o:bender:cc612_firmware:*:*:*:*:*:*:*:*
bender cc613_firmware >= 5.11.0, < 5.11.2 cpe:2.3:o:bender:cc613_firmware:*:*:*:*:*:*:*:*
bender cc613_firmware >= 5.12.0, < 5.12.5 cpe:2.3:o:bender:cc613_firmware:*:*:*:*:*:*:*:*
bender cc613_firmware >= 5.13.0, < 5.13.2 cpe:2.3:o:bender:cc613_firmware:*:*:*:*:*:*:*:*
bender cc613_firmware >= 5.20.0, < 5.20.2 cpe:2.3:o:bender:cc613_firmware:*:*:*:*:*:*:*:*
bender icc15xx_firmware >= 5.11.0, < 5.11.2 cpe:2.3:o:bender:icc15xx_firmware:*:*:*:*:*:*:*:*
bender icc15xx_firmware >= 5.12.0, < 5.12.5 cpe:2.3:o:bender:icc15xx_firmware:*:*:*:*:*:*:*:*
bender icc15xx_firmware >= 5.13.0, < 5.13.2 cpe:2.3:o:bender:icc15xx_firmware:*:*:*:*:*:*:*:*
bender icc15xx_firmware >= 5.20.0, < 5.20.2 cpe:2.3:o:bender:icc15xx_firmware:*:*:*:*:*:*:*:*
bender icc16xx_firmware >= 5.11.0, < 5.11.2 cpe:2.3:o:bender:icc16xx_firmware:*:*:*:*:*:*:*:*
bender icc16xx_firmware >= 5.12.0, < 5.12.5 cpe:2.3:o:bender:icc16xx_firmware:*:*:*:*:*:*:*:*
bender icc16xx_firmware >= 5.13.0, < 5.13.2 cpe:2.3:o:bender:icc16xx_firmware:*:*:*:*:*:*:*:*
bender icc16xx_firmware >= 5.20.0, < 5.20.2 cpe:2.3:o:bender:icc16xx_firmware:*:*:*:*:*:*:*:*

References for CVE-2021-34587

URL Tags
https://cert.vde.com/en/advisories/VDE-2021-047 Third Party Advisory
cvelogic Threat Intelligence