CVE-2019-8921: bluez
Vulnerability summary
CVE-2019-8921 is a medium (CVSS 6.5) vulnerability in bluez. EPSS estimates a 1.01% chance of exploitation in the next 30 days, higher than 62.4% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 6 · Related 4Timeline
- 29-11-2021PublishedVulnerability first disclosed.
- 15-04-2026Last modifiedVulnerability information updated.
Description
An issue was discovered in bluetoothd in BlueZ through 5.48. The vulnerability lies in the handling of a SVC_ATTR_REQ by the SDP implementation. By crafting a malicious CSTATE, it is possible to trick the server into returning more bytes than the buffer actually holds, resulting in leaking arbitrary heap data. The root cause can be found in the function service_attr_req of sdpd-request.c. The server does not check whether the CSTATE data is the same in consecutive requests, and instead simply trusts that it is the same.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- OSV · DebianEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- NVDNIST6.5MediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS trend
Probability
1.01%
Chance of exploitation in the next 30 days
Percentile
62%
Versus all other CVEs
30-day change
+0.07 pp
From 0.94% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (ssd-disclosure.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Debian2 products
- bluez< 5.54-1
- debian_linuxEOL10.0
Bluez1 product
- bluez≤ 5.48
Ubuntu1 product
- bluez< 5.37-0ubuntu5.3+esm5 | < 5.48-0ubuntu3.6
3 vendors · 4 products
References
7 links- ssd-disclosure.com/ssd-advisory-linux-bluez-information-leak-and-heap-overflow/REPORTExploitPatchThird Party Advisory
- security.netapp.com/advisory/ntap-20211203-0002/Third Party Advisory
