cve.bz

CVE-2019-9900

8.3 highEPSS 3.7%

High (8.3). EPSS 3.7% chance of exploitation in the next 30 days.

When parsing HTTP/1.x header values, Envoy 1.9.0 and before does not reject embedded zero characters (NUL, ASCII 0x0). This allows remote attackers crafting header values containing embedded NUL characters to potentially bypass header matching rules, gaining access to unauthorized resources.

Severity

CVSS 3.1

8.3 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
EPSS
3.7% chance of exploitation in the next 30 days; higher than 89% of CVEs (scores of 2026-10-31)
CWE
CWE-74
Published
Modified
Record from
the NVD, synced

Affected

References

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