HOMEVULNERABILITIESCVE-2019-6256
CRITICAL

CVE-2019-6256

CWE-755Published: January 14, 2019· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

A Denial of Service issue was discovered in the LIVE555 Streaming Media libraries as used in Live555 Media Server 0.93. It can cause an RTSPServer crash in handleHTTPCmd_TunnelingPOST, when RTSP-over-HTTP tunneling is supported, via x-sessioncookie HTTP headers in a GET request and a POST request within the same TCP session. This occurs because of a call to an incorrect virtual function pointer in the readSocket function in GroupsockHelper.cpp.

NVD Source

Technical Analysis

CVE-2019-6256 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 complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Debian1 product(s)
debian linux
live5551 product(s)
live555 media server
Source: NVD CPE · 3 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
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Official Patches & Advisories

ADVISORYhttps://github.com/rgaufman/live555/issues/19
ADVISORYhttps://lists.debian.org/debian-lts-announce/2019/02/msg00037.html
ADVISORYhttps://seclists.org/bugtraq/2019/Mar/22
ADVISORYhttps://www.debian.org/security/2019/dsa-4408
ADVISORYhttps://github.com/rgaufman/live555/issues/19
ADVISORYhttps://lists.debian.org/debian-lts-announce/2019/02/msg00037.html
ADVISORYhttps://seclists.org/bugtraq/2019/Mar/22
ADVISORYhttps://www.debian.org/security/2019/dsa-4408

All References (10)

→
https://github.com/rgaufman/live555/issues/19Exploit · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2019/02/msg00037.htmlMailing List · Third Party Advisory
→
https://seclists.org/bugtraq/2019/Mar/22Issue Tracking · Mailing List · Third Party Advisory
→
https://security.gentoo.org/glsa/202005-06
→
https://www.debian.org/security/2019/dsa-4408Third Party Advisory
→
https://github.com/rgaufman/live555/issues/19Exploit · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2019/02/msg00037.htmlMailing List · Third Party Advisory
→
https://seclists.org/bugtraq/2019/Mar/22Issue Tracking · Mailing List · Third Party Advisory
→
https://security.gentoo.org/glsa/202005-06
→
https://www.debian.org/security/2019/dsa-4408Third Party Advisory

Quick Facts

CVE IDCVE-2019-6256
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-755
CISA KEVNo
Affected2 vendor(s)
PublishedJan 14, 2019

Related CVEs (CWE-755)

CVE-2023-6267
9.8
CVE-2021-43272
9.8
CVE-2021-42142
9.8
CVE-2019-14431
9.8
CVE-2019-12815
9.8
CVE-2023-27595
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-6256 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.COM. CVE data is provided under the NVD usage policy.
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