How severe is CVE-2021-35233?

CVE-2021-35233 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2021-35233 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-35233?

CVE-2021-35233 affects Solarwinds Kiwi Syslog Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-35233?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-35233 published?

CVE-2021-35233 was published on 2021-10-27 and last updated on 2026-06-17.

CVE-2021-35233

CVE-2021-35233 is a medium-severity vulnerability in Solarwinds Kiwi Syslog Server with a CVSS 3.x base score of 5.3. 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-16.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-16
Affected product: Solarwinds Kiwi Syslog Server
Published: 2021-10-27
Last modified: 2026-06-17

Description

The HTTP TRACK & TRACE methods were enabled in Kiwi Syslog Server 9.7.1 and earlier. These methods are intended for diagnostic purposes only. If enabled, the web server will respond to requests that use these methods by returning exact HTTP request that was received in the response to the client. This may lead to the disclosure of sensitive information such as internal authentication headers appended by reverse proxies.

Frequently asked questions

What is CVE-2021-35233?: The HTTP TRACK & TRACE methods were enabled in Kiwi Syslog Server 9.7.1 and earlier. These methods are intended for diagnostic purposes only. If enabled, the web server will respond to requests that use these methods by returning exact HTTP request that was received in the response to the client. This may lead to the disclosure of sensitive information such as internal authentication headers appended by reverse proxies.
How severe is CVE-2021-35233?: CVE-2021-35233 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2021-35233 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-35233?: CVE-2021-35233 affects Solarwinds Kiwi Syslog Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-35233?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-35233 published?: CVE-2021-35233 was published on 2021-10-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:solarwinds:kiwi_syslog_server:*:*:*:*:*:*:*:*

More vulnerabilities in Solarwinds Kiwi Syslog Server

CVE-2021-35231 — Medium (CVSS 6.7): As a result of an unquoted service path vulnerability present in the Kiwi Syslog Server Installation Wizard, a local…
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