How severe is CVE-2021-22735?

CVE-2021-22735 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-22735 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-22735?

CVE-2021-22735 primarily affects Schneider-electric Spacelynk Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-22735?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-22735 published?

CVE-2021-22735 was published on 2021-05-26 and last updated on 2026-06-17.

CVE-2021-22735

CVE-2021-22735 is a high-severity vulnerability in Schneider-electric Spacelynk Firmware with a CVSS 3.x base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-347.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v2: 6.5
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-347
Affected product: Schneider-electric Spacelynk Firmware
Published: 2021-05-26
Last modified: 2026-06-17

Description

Improper Verification of Cryptographic Signature vulnerability exists inhomeLYnk (Wiser For KNX) and spaceLYnk V2.60 and prior which could allow remote code execution when unauthorized code is copied to the device.

Frequently asked questions

What is CVE-2021-22735?: Improper Verification of Cryptographic Signature vulnerability exists inhomeLYnk (Wiser For KNX) and spaceLYnk V2.60 and prior which could allow remote code execution when unauthorized code is copied to the device.
How severe is CVE-2021-22735?: CVE-2021-22735 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-22735 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-22735?: CVE-2021-22735 primarily affects Schneider-electric Spacelynk Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-22735?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-22735 published?: CVE-2021-22735 was published on 2021-05-26 and last updated on 2026-06-17.

References

https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-130-04

Affected products (2)

cpe:2.3:o:schneider-electric:spacelynk_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:homelynk_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Schneider-electric Spacelynk Firmware

CVE-2022-22810 — Critical (CVSS 9.8): A CWE-307: Improper Restriction of Excessive Authentication Attempts vulnerability exists that could allow an attacker…
CVE-2021-22738 — Critical (CVSS 9.8): Use of a Broken or Risky Cryptographic Algorithm vulnerability exists in homeLYnk (Wiser For KNX) and spaceLYnk V2.60…
CVE-2021-22737 — Critical (CVSS 9.8): Insufficiently Protected Credentials vulnerability exists in homeLYnk (Wiser For KNX) and spaceLYnk V2.60 and prior…
CVE-2019-6832 — High (CVSS 8.3): A CWE-287: Authentication vulnerability exists in spaceLYnk (all versions before 2.4.0) and Wiser for KNX (all versions…
CVE-2022-22811 — High (CVSS 8.1): A CWE-352: Cross-Site Request Forgery (CSRF) vulnerability exists that could induce users to perform unintended…
CVE-2021-22733 — High (CVSS 7.8): Improper Privilege Management vulnerability exists in homeLYnk (Wiser For KNX) and spaceLYnk V2.60 and prior which…

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