Vulnerability Database

393,392

Total vulnerabilities in the database

CVE-2012-3949 — cisco / unified_communications_manager

Improper Input Validation

The SIP implementation in Cisco Unified Communications Manager (CUCM) 6.x and 7.x before 7.1(5b)su5, 8.x before 8.5(1)su4, and 8.6 before 8.6(2a)su1; Cisco IOS 12.2 through 12.4 and 15.0 through 15.2; and Cisco IOS XE 3.3.xSG before 3.3.1SG, 3.4.xS, and 3.5.xS allows remote attackers to cause a denial of service (service crash or device reload) via a crafted SIP message containing an SDP session description, aka Bug IDs CSCtw66721, CSCtj33003, and CSCtw84664.

  • Published: Sep 27, 2012
  • Updated: Oct 3, 2026
  • CVE: CVE-2012-3949
  • Severity: High
  • Exploit:
  • CISA KEV:

CVSS v2:

  • Severity: High
  • Score: 7.8
  • AV:N/AC:L/Au:N/C:N/I:N/A:C

CWEs:

Software Affected versions
cisco / unified_communications_manager = 6.0(1a)
cisco / unified_communications_manager = 6.0(1b)
cisco / unified_communications_manager = 6.1(1)
cisco / unified_communications_manager = 6.1(1a)
cisco / unified_communications_manager = 6.1(1b)
cisco / unified_communications_manager = 6.1(2)
cisco / unified_communications_manager = 6.1(3)
cisco / unified_communications_manager = 6.1(3a)
cisco / unified_communications_manager = 6.1(3b)
cisco / unified_communications_manager = 6.1(4)
cisco / unified_communications_manager = 6.1(4a)
cisco / unified_communications_manager = 6.1(4b)
cisco / unified_communications_manager = 6.1(5)
cisco / unified_communications_manager = 7.1(1)
cisco / unified_communications_manager = 7.1(2)
cisco / unified_communications_manager = 7.1(2a)
cisco / unified_communications_manager = 7.1(2b)
cisco / unified_communications_manager = 7.1(3)
cisco / unified_communications_manager = 7.1(3a)
cisco / unified_communications_manager = 7.1(3b)
cisco / unified_communications_manager = 7.1(5)
cisco / unified_communications_manager = 7.1(5a)
cisco / unified_communications_manager = 7.1(5b)
cisco / unified_communications_manager = 7.1(5b)su1
cisco / unified_communications_manager = 7.1(5b)su1a
cisco / unified_communications_manager = 7.1(5b)su2
cisco / unified_communications_manager = 7.1(5b)su3
cisco / unified_communications_manager = 7.1(5b)su4
cisco / unified_communications_manager = 8.0
cisco / unified_communications_manager = 8.0(1)
cisco / unified_communications_manager = 8.0(2)
cisco / unified_communications_manager = 8.0(2a)
cisco / unified_communications_manager = 8.0(2b)
cisco / unified_communications_manager = 8.0(2c)
cisco / unified_communications_manager = 8.0(3)
cisco / unified_communications_manager = 8.0(3a)
cisco / unified_communications_manager = 8.5(1)su1
cisco / unified_communications_manager = 8.5(1)su2
cisco / unified_communications_manager = 8.5(1)su3
cisco / ios = 12.2
cisco / ios = 12.2b
cisco / ios = 12.2bc
cisco / ios = 12.2bw
cisco / ios = 12.2bx
cisco / ios = 12.2by
cisco / ios = 12.2bz
cisco / ios = 12.2ca
cisco / ios = 12.2cx
cisco / ios = 12.2cy
cisco / ios = 12.2cz
cisco / ios = 12.2da
cisco / ios = 12.2dd
cisco / ios = 12.2dx
cisco / ios = 12.2ew
cisco / ios = 12.2ewa
cisco / ios = 12.2ex
cisco / ios = 12.2ey
cisco / ios = 12.2ez
cisco / ios = 12.2fx
cisco / ios = 12.2fy
cisco / ios = 12.2fz
cisco / ios = 12.2irb
cisco / ios = 12.2ixa
cisco / ios = 12.2ixb
cisco / ios = 12.2ixc
cisco / ios = 12.2ixd
cisco / ios = 12.2ixe
cisco / ios = 12.2ixf
cisco / ios = 12.2ixg
cisco / ios = 12.2l
cisco / ios = 12.2mb
cisco / ios = 12.2rc
cisco / ios = 12.2s
cisco / ios = 12.2sb
cisco / ios = 12.2sbc
cisco / ios = 12.2sca
cisco / ios = 12.2scb
cisco / ios = 12.2se
cisco / ios = 12.2sea
cisco / ios = 12.2seb
cisco / ios = 12.2sec
cisco / ios = 12.2sed
cisco / ios = 12.2see
cisco / ios = 12.2sef
cisco / ios = 12.2seg
cisco / ios = 12.2sg
cisco / ios = 12.2sga
cisco / ios = 12.2sm
cisco / ios = 12.2sr
cisco / ios = 12.2sra
cisco / ios = 12.2srb
cisco / ios = 12.2src
cisco / ios = 12.2su
cisco / ios = 12.2sv
cisco / ios = 12.2sva
cisco / ios = 12.2svc
cisco / ios = 12.2svd
cisco / ios = 12.2sve
cisco / ios = 12.2sw
cisco / ios = 12.2sx
cisco / ios = 12.2sxa
cisco / ios = 12.2sxb
cisco / ios = 12.2sxd
cisco / ios = 12.2sxe
cisco / ios = 12.2sxf
cisco / ios = 12.2sxi
cisco / ios = 12.2sy
cisco / ios = 12.2sz
cisco / ios = 12.2t
cisco / ios = 12.2tpc
cisco / ios = 12.2xa
cisco / ios = 12.2xb
cisco / ios = 12.2xc
cisco / ios = 12.2xd
cisco / ios = 12.2xe
cisco / ios = 12.2xf
cisco / ios = 12.2xg
cisco / ios = 12.2xh
cisco / ios = 12.2xi
cisco / ios = 12.2xj
cisco / ios = 12.2xk
cisco / ios = 12.2xl
cisco / ios = 12.2xm
cisco / ios = 12.2xn
cisco / ios = 12.2xnb
cisco / ios = 12.2xnc
cisco / ios = 12.2xnd
cisco / ios = 12.2xo
cisco / ios = 12.2xq
cisco / ios = 12.2xr
cisco / ios = 12.2xs
cisco / ios = 12.2xt
cisco / ios = 12.2xu
cisco / ios = 12.2xv
cisco / ios = 12.2xw
cisco / ios = 12.2ya
cisco / ios = 12.2yb
cisco / ios = 12.2yc
cisco / ios = 12.2yd
cisco / ios = 12.2ye
cisco / ios = 12.2yf
cisco / ios = 12.2yg
cisco / ios = 12.2yh
cisco / ios = 12.2yj
cisco / ios = 12.2yk
cisco / ios = 12.2yl
cisco / ios = 12.2ym
cisco / ios = 12.2yn
cisco / ios = 12.2yo
cisco / ios = 12.2yp
cisco / ios = 12.2yq
cisco / ios = 12.2yr
cisco / ios = 12.2ys
cisco / ios = 12.2yt
cisco / ios = 12.2yu
cisco / ios = 12.2yv
cisco / ios = 12.2yw
cisco / ios = 12.2yx
cisco / ios = 12.2yy
cisco / ios = 12.2yz
cisco / ios = 12.2za
cisco / ios = 12.2zb
cisco / ios = 12.2zc
cisco / ios = 12.2zd
cisco / ios = 12.2ze
cisco / ios = 12.2zf
cisco / ios = 12.2zg
cisco / ios = 12.2zh
cisco / ios = 12.2zj
cisco / ios = 12.2zl
cisco / ios = 12.2zp
cisco / ios = 12.2zu
cisco / ios = 12.2zx
cisco / ios = 12.2zy
cisco / ios = 12.2zya
cisco / ios = 12.3
cisco / ios = 12.3b
cisco / ios = 12.3bc
cisco / ios = 12.3bw
cisco / ios = 12.3ja
cisco / ios = 12.3jea
cisco / ios = 12.3jeb
cisco / ios = 12.3jec
cisco / ios = 12.3jk
cisco / ios = 12.3jl
cisco / ios = 12.3jx
cisco / ios = 12.3t
cisco / ios = 12.3tpc
cisco / ios = 12.3va
cisco / ios = 12.3xa
cisco / ios = 12.3xb
cisco / ios = 12.3xc
cisco / ios = 12.3xd
cisco / ios = 12.3xe
cisco / ios = 12.3xf
cisco / ios = 12.3xg
cisco / ios = 12.3xi
cisco / ios = 12.3xk
cisco / ios = 12.3xl
cisco / ios = 12.3xq
cisco / ios = 12.3xr
cisco / ios = 12.3xs
cisco / ios = 12.3xu
cisco / ios = 12.3xw
cisco / ios = 12.3xx
cisco / ios = 12.3xy
cisco / ios = 12.3xz
cisco / ios = 12.3ya
cisco / ios = 12.3yd
cisco / ios = 12.3yf
cisco / ios = 12.3yg
cisco / ios = 12.3yh
cisco / ios = 12.3yj
cisco / ios = 12.3yk
cisco / ios = 12.3ym
cisco / ios = 12.3yq
cisco / ios = 12.3ys
cisco / ios = 12.3yt
cisco / ios = 12.3yu
cisco / ios = 12.3yx
cisco / ios = 12.3yz
cisco / ios = 12.3za
cisco / ios = 15.0
cisco / ios = 15.0(1)s1
cisco / ios = 15.0(1)s2
cisco / ios = 15.0(1)se
cisco / ios = 15.0m
cisco / ios = 15.0mr
cisco / ios = 15.0mra
cisco / ios = 15.0s
cisco / ios = 15.0sa
cisco / ios = 15.0sg
cisco / ios = 15.0xa
cisco / ios = 15.0xo
cisco / ios = 15.1
cisco / ios = 15.1(1)xb1
cisco / ios = 15.1(2)t
cisco / ios = 15.1(3)t
cisco / ios = 15.1(4)m
cisco / ios = 15.1(4)m1
cisco / ios = 15.1ey
cisco / ios = 15.1gc
cisco / ios = 15.1m
cisco / ios = 15.1s
cisco / ios = 15.1t
cisco / ios = 15.1xb
cisco / ios = 15.2
cisco / ios_xe = 3.3.0sg
cisco / ios_xe = 3.3.1s
cisco / ios_xe = 3.3.1sg
cisco / ios_xe = 3.4.0as
cisco / ios_xe = 3.4.0s
cisco / ios_xe = 3.4.1s
cisco / ios_xe = 3.4.2s
cisco / ios_xe = 3.4.3s
cisco / ios_xe = 3.4.xs
cisco / ios_xe = 3.5.0s
cisco / ios_xe = 3.5.1s
cisco / ios_xe = 3.5.2s
cisco / ios_xe = 3.5.xs

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.