CVE-2021-4156
An out-of-bounds read flaw was found in libsndfile's FLAC codec functionality.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.75%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
An out-of-bounds read flaw was found in libsndfile's FLAC codec functionality. An attacker who is able to submit a specially crafted file (via tricking a user to open or otherwise) to an application linked with libsndfile and using the FLAC codec, could trigger an out-of-bounds read that would most likely cause a crash but could potentially leak memory information that could be used in further exploitation of other flaws.
- CVSS 3.1
- 7.1 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
- EPSS
- 1.75% probability · 77th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-125
- Affected
- libsndfile project/libsndfile · debian/debian linux
- Source
- secalert@redhat.com
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2027690Exploit, Issue Tracking, Third Party Advisory
- https://github.com/libsndfile/libsndfile/issues/731Exploit, Issue Tracking, Third Party Advisory
- https://github.com/libsndfile/libsndfile/pull/732/commits/4c30646abf7834e406f7e2429c70bc254e18beabPatch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/06/msg00020.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/09/msg00036.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202309-11
- https://bugzilla.redhat.com/show_bug.cgi?id=2027690Exploit, Issue Tracking, Third Party Advisory
- https://github.com/libsndfile/libsndfile/issues/731Exploit, Issue Tracking, Third Party Advisory
- https://github.com/libsndfile/libsndfile/pull/732/commits/4c30646abf7834e406f7e2429c70bc254e18beabPatch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/06/msg00020.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/09/msg00036.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2025/12/msg00013.html
- https://security.gentoo.org/glsa/202309-11
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.