HIGH
CVE-2019-19956
CWE-401Published: December 24, 2019· Updated: Jun 17, 2026
7.5
CVSS v3.1
Official Description
xmlParseBalancedChunkMemoryRecover in parser.c in libxml2 before 2.9.10 has a memory leak related to newDoc->oldNs.
Technical Analysis
CVE-2019-19956 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Vendors & Products
Canonical1 product(s)
ubuntu linux
Debian1 product(s)
debian linux
Fedora1 product(s)
fedora
netapp6 product(s)
active iq unified managerclustered data ontapclustered data ontap antivirus connectormanageability software development kitontap select deploy administration utilitysteelstore cloud integrated storage
Oracle1 product(s)
real user experience insight
siemens1 product(s)
sinema remote connect server
xmlsoft1 product(s)
libxml2
Source: NVD CPE · 18 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
ADVISORYhttps://usn.ubuntu.com/4274-1/
ADVISORYhttps://usn.ubuntu.com/4274-1/
All References (24)
→
https://cert-portal.siemens.com/productcert/pdf/ssa-292794.pdfThird Party Advisory
→
https://gitlab.gnome.org/GNOME/libxml2/commit/5a02583c7e683896d84878bd90641d8d9b0d0549Patch · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2019/12/msg00032.htmlMailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2020/09/msg00009.htmlMailing List · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20200114-0002/Third Party Advisory
→
https://us-cert.cisa.gov/ics/advisories/icsa-21-103-08Third Party Advisory · US Government Resource
→
https://usn.ubuntu.com/4274-1/Third Party Advisory
→
https://www.oracle.com/security-alerts/cpujul2020.htmlThird Party Advisory
→
https://cert-portal.siemens.com/productcert/pdf/ssa-292794.pdfThird Party Advisory
Quick Facts
CVE IDCVE-2019-19956
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-401
CISA KEVNo
Affected7 vendor(s)
PublishedDec 24, 2019
Related CVEs (CWE-401)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2019-19956 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.