SSL - CVE-2019-1563 Subscribe to Security Advisories

Friday, October 18, 2019
Friday, October 18, 2019

In September 2019, released a security advisory [1] detailing several security issues. The following vulnerability may affect the TLS/SSL data plane of ACOS devices reported in that advisory and is addressed in this document.

Item # Vulnerability ID Score Source Score Summary
1 CVE-2019-1563 CVSS 3.0 3.7 Low openssl: Information disclosure in PKCS7_dataDecode and CMS_decrypt_set1_pkey [2]

Affected Releases

The table below indicates releases of ACOS exposed to this vulnerability and ACOS releases that address them. ACOS release families not indicated below are unaffected by these vulnerabilities.

Customers using affected ACOS releases can overcome vulnerability exposures by updating to the indicated resolved release. If the table does not list a corresponding resolved or unaffected release, then no ACOS release update is currently available.

Releases AffectedReleases Resolved or Unaffected

5.0.0 – 5.0.0-P1


4.1.4 – 4.1.4-GR1-P2


4.1.2 – 4.1.2-P3

4.1.4-GR1-P3, 5.0.0-P2

4.1.1 – 4.1.1-P11


4.1.0 – 4.1.0-P12

4.1.1-P12, 4.1.4-GR1-P3, 5.0.0-P2

2.8.2 – 2.8.2-P10

4.1.4-GR1-P3, 5.0.0-P2

2.7.2 – 2.7.2-P14

4.1.1-P12, 4.1.4-GR1-P3, 5.0.0-P2

Workarounds and Mitigations 

Exclude RSA-based ciphers in the server-ssl configuration.

Software Updates 

Software updates that address these vulnerabilities are or will be published at the following URL:

Vulnerability Details

The following table shares brief descriptions of the vulnerabilities addressed in this document.

Vulnerability IDVulnerability Description

Some HTTP/2 implementations are vulnerable to unconstrained internal data buffering, potentially leading to a denial of service. The attacker opens the HTTP/2 window so the peer can send without constraint; however, they leave the TCP window closed so the peer cannot actually write (many of) the bytes on the wire. The attacker then sends a stream of requests for a large response object. Depending on how the servers queue the responses, this can consume excess memory, CPU, or both.



Modification History 
October 18, 2019

Initial Publication

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