CVE-2017-9078: debian debian_linux Double Free
Vulnerability summary
CVE-2017-9078 is a high (CVSS 8.8) Double Free vulnerability in debian debian_linux. EPSS estimates a 5.47% chance of exploitation in the next 30 days, higher than 92.7% of scored vulnerabilities.
Not severe (CVSS 8.8, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 2Timeline
- 19-05-2017PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
The server in Dropbear before 2017.75 might allow post-authentication root remote code execution because of a double free in cleanup of TCP listeners when the -a option is enabled.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · AlpineEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
5.47%
Chance of exploitation in the next 30 days
Percentile
93%
Versus all other CVEs
30-day change
Decrease -0.22 pp
From 5.69% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Debian2 products
- dropbear< 2016.74-5
- debian_linuxEOL8.0
Alpine1 product
- dropbear< 2017.75-r0
Dropbear_ssh_project1 product
- dropbear_ssh< 2017.75
Netapp1 product
Ubuntu1 product
- dropbearAll versions (No fix recorded)
5 vendors · 6 products
References
8 links
- lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2017q2/001985.htmlX Refsource CONFIRMMailing ListPatchThird Party AdvisoryREPORT