CVE-2019-25036: debian debian_linux Reachable Assertion
CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2019-25036DEBIAN-CVE-2019-25036
Published 27-04-2021Last modified 05-08-2024
Vulnerability summary
CVE-2019-25036 is a high (CVSS 7.5) Reachable Assertion vulnerability in debian debian_linux. EPSS estimates a 2.07% chance of exploitation in the next 30 days, higher than 81.1% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
2.07%
0%100%
Low · +0.08 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 8 · Related 5Timeline
- 27-04-2021PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
Unbound before 1.9.5 allows an assertion failure and denial of service in synth_cname. 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
CVSS metrics
4 scores · 3 sources · 2 versionsHigh 7.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
2.07%
Chance of exploitation in the next 30 days
Percentile
81%
Versus all other CVEs
30-day change
+0.08 pp
From 1.99% on 19-09-2026
19-09-202619-10-2026
EPSS score2.07%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian2 products
- unbound< 1.9.6-1
- debian_linuxEOL9.0
Nlnetlabs1 product
- unbound< 1.9.5
Ubuntu1 product
- unbound< 1.6.7-1ubuntu2.4 | < 1.9.4-2ubuntu1.2
3 vendors · 4 products
References
7 links- ostif.org/our-audit-of-unbound-dns-by-x41-d-sec-full-results/X Refsource MISCREPORTPatchThird Party Advisory
lists.debian.org/debian-lts-announce/2021/05/msg00007.htmlMailing ListX Refsource MLISTThird Party Advisory