How severe is CVE-2019-20800?

CVE-2019-20800 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-20800 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-20800?

CVE-2019-20800 affects Cherokee-project Cherokee. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-20800?

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

When was CVE-2019-20800 published?

CVE-2019-20800 was published on 2020-05-18 and last updated on 2026-06-17.

CVE-2019-20800

CVE-2019-20800 is a critical-severity vulnerability in Cherokee-project Cherokee with a CVSS 3.x base score of 9.8. 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-787.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Cherokee-project Cherokee
Published: 2020-05-18
Last modified: 2026-06-17

Description

In Cherokee through 1.2.104, remote attackers can trigger an out-of-bounds write in cherokee_handler_cgi_add_env_pair in handler_cgi.c by sending many request headers, as demonstrated by a GET request with many "Host: 127.0.0.1" headers.

Frequently asked questions

What is CVE-2019-20800?: In Cherokee through 1.2.104, remote attackers can trigger an out-of-bounds write in cherokee_handler_cgi_add_env_pair in handler_cgi.c by sending many request headers, as demonstrated by a GET request with many "Host: 127.0.0.1" headers.
How severe is CVE-2019-20800?: CVE-2019-20800 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-20800 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-20800?: CVE-2019-20800 affects Cherokee-project Cherokee. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-20800?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2019-20800 published?: CVE-2019-20800 was published on 2020-05-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:cherokee-project:cherokee:*:*:*:*:*:*:*:*

More vulnerabilities in Cherokee-project Cherokee

CVE-2019-20798 — High (CVSS 8.4): An XSS issue was discovered in handler_server_info.c in Cherokee through 1.2.104. The requested URL is improperly…
CVE-2020-12845 — High (CVSS 7.5): Cherokee 0.4.27 to 1.2.104 is affected by a denial of service due to a NULL pointer dereferences. A remote…
CVE-2019-20799 — High (CVSS 7.5): In Cherokee through 1.2.104, multiple memory corruption errors may be used by a remote attacker to destabilize the work…
CVE-2014-4668 — Medium (CVSS 6.8): The cherokee_validator_ldap_check function in validator_ldap.c in Cherokee 1.2.103 and earlier, when LDAP is used, does…
CVE-2011-2191 — Medium (CVSS 6.8): Cross-site request forgery (CSRF) vulnerability in Cherokee-admin in Cherokee before 1.2.99 allows remote attackers to…
CVE-2009-4489 — Medium (CVSS 5.0): header.c in Cherokee before 0.99.32 writes data to a log file without sanitizing non-printable characters, which might…

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