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CVE-2019-1559

0-byte record padding oracle

Medium5.9EPSS 17.1%
Published
Updated
Reserved
Assigned by
openssl

Description

If an application encounters a fatal protocol error and then calls SSL_shutdown() twice (once to send a close_notify, and once to receive one) then OpenSSL can respond differently to the calling application if a 0 byte record is received with invalid padding compared to if a 0 byte record is received with an invalid MAC. If the application then behaves differently based on that in a way that is detectable to the remote peer, then this amounts to a padding oracle that could be used to decrypt data. In order for this to be exploitable "non-stitched" ciphersuites must be in use. Stitched ciphersuites are optimised implementations of certain commonly used ciphersuites. Also the application must call SSL_shutdown() twice even if a protocol error has occurred (applications should not do this but some do anyway). Fixed in OpenSSL 1.0.2r (Affected 1.0.2-1.0.2q).

Scores

CVSS scores of CVE-2019-1559, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.1Medium5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS (exploitation in 30 days)
17.1% · top 2.9% of all CVEs (6 Nov 2026)
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.

Weakness

Affected products

  • OpenSSL · OpenSSL

    • affected Fixed in OpenSSL 1.0.2r (Affected 1.0.2-1.0.2q)

References (36)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .