Integer overflow in Nlnetlabs Unbound
CVE-2019-25034
Unbound before 1.9.5 allows an integer overflow in sldns_str2wire_dname_buf_origin, leading to an out-of-bounds write. NOTE: The vendor disputes that this is a vulnerability. Although the code may be vulnerable, a running Unbound installation cannot be remotely or locally exploited
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.020 (80.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 80.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000
Affected products
- Nlnetlabs Unbound
- Debian Linux — versions 9.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- ostif.org/our-audit-of-unbound-dns-by-x41-d-sec-full-results/ (Patch, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2021/05/msg00007.html (mailing-list, Mailing List, Third Party Advisory)
- security.netapp.com/advisory/ntap-20210507-0007/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2019-25034?
- CVE-2019-25034 is a critical-severity vulnerability in Nlnetlabs Unbound, classified under Integer Overflow or Wraparound. CVSS score: 9.8/10. Published 2021-04-27.
- How severe is CVE-2019-25034?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2019-25034 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.