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    CVE-2021-27737

    Apache Traffic Server 9.0.0 is vulnerable to a remote DOS attack on the experimental Slicer plugin.

    Published:May 14, 2021
    Last Modified:Nov 21, 2024
    EPS:May 14, 2021
    EPSS Score:0.09467
    CVSS Score:7.5

    Affected Products

    Vendor
    Apache
    Product
    Traffic Server

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-65100 (CVSS 6.3) — Apache Traffic Server updates the HTTP/2 HPACK dynamic table before confirming the header block encoded succes…
    CVE-2026-58189 (CVSS 8.2) — Apache Traffic Server allows redirect-limit bypass when plugins reset the retry counter, enabling SSRF amplifi…
    CVE-2026-58188 (CVSS 8.4) — Several Apache Traffic Server experimental plugins have memory-safety and limit-bypass errors. This issue aff…
    CVE-2026-58186 (CVSS 8.2) — The Apache Traffic Server webp_transform plugin can decode unsafely and serve mislabeled, cacheable responses.…
    CVE-2026-58185 (CVSS 8.2) — The Apache Traffic Server intercept plugin has a use-after-free. This issue affects Apache Traffic Server: fr…
    CVE-2026-58184 (CVSS 8.3) — The Apache Traffic Server header_rewrite plugin can crash or corrupt memory during cookie operations and CIDR …
    CVE-2026-58183 (CVSS 8.2) — The Apache Traffic Server prefetch plugin can crash when processing attacker-influenced input. This issue aff…
    CVE-2026-58182 (CVSS 8.2) — The Apache Traffic Server ts_lua plugin mishandles initialization, transform context, and per-instance state. …
    CVE-2026-58181 (CVSS 8.2) — The Apache Traffic Server uri_signing and url_sig plugins can exhaust the stack or crash on attacker input. T…
    CVE-2026-58180 (CVSS 8.2) — The Apache Traffic Server txn_box plugin overflows the stack from attacker-controlled input. This issue affec…

    References

    https://lists.apache.org/thread.html/r74f72650c3590478f028ea3a1b8cab2a33d20ad9ff407e894ca70525%40%3Cannounce.trafficserver.apache.org%3E
    https://lists.apache.org/thread.html/r74f72650c3590478f028ea3a1b8cab2a33d20ad9ff407e894ca70525%40%3Cannounce.trafficserver.apache.org%3E
    https://lists.apache.org/thread.html/r74f72650c3590478f028ea3a1b8cab2a33d20ad9ff407e894ca70525%40%3Cannounce.trafficserver.apache.org%3E
    https://lists.apache.org/thread.html/r74f72650c3590478f028ea3a1b8cab2a33d20ad9ff407e894ca70525%40%3Cannounce.trafficserver.apache.org%3E
    https://lists.apache.org/thread.html/r74f72650c3590478f028ea3a1b8cab2a33d20ad9ff407e894ca70525%40%3Cdev.trafficserver.apache.org%3E
    https://lists.apache.org/thread.html/r74f72650c3590478f028ea3a1b8cab2a33d20ad9ff407e894ca70525%40%3Cusers.trafficserver.apache.org%3E
    https://lists.apache.org/thread.html/r74f72650c3590478f028ea3a1b8cab2a33d20ad9ff407e894ca70525%40%3Cannounce.trafficserver.apache.org%3E
    https://lists.apache.org/thread.html/r74f72650c3590478f028ea3a1b8cab2a33d20ad9ff407e894ca70525%40%3Cannounce.trafficserver.apache.org%3E
    https://lists.apache.org/thread.html/r74f72650c3590478f028ea3a1b8cab2a33d20ad9ff407e894ca70525%40%3Cannounce.trafficserver.apache.org%3E
    https://lists.apache.org/thread.html/r74f72650c3590478f028ea3a1b8cab2a33d20ad9ff407e894ca70525%40%3Cannounce.trafficserver.apache.org%3E
    https://lists.apache.org/thread.html/r74f72650c3590478f028ea3a1b8cab2a33d20ad9ff407e894ca70525%40%3Cdev.trafficserver.apache.org%3E
    https://lists.apache.org/thread.html/r74f72650c3590478f028ea3a1b8cab2a33d20ad9ff407e894ca70525%40%3Cusers.trafficserver.apache.org%3E

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High