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TI-2001-01136 Aliases CVE-2001-1183GHSA-xfqr-hx55-mjcw

PPTP implementation in Cisco IOS 12.1 and 12.2 allows remote attackers to cause a denial…

Priority LOW 29Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
— Not recorded in CVSS 2.0
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · Partial
Fix status
No fix listed

Attack profile from CVSS 2.0 · NVD. Fix status from CNA.

Summary

PPTP implementation in Cisco IOS 12.1 and 12.2 allows remote attackers to cause a denial of service (crash) via a malformed packet.

Why it matters now

EPSS 0.0382 90th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 13

CPEVersionsRoleVendor
cpe:2.3:o:cisco:ios:12.1e:*:*:*:*:*:*:*12.1eVulnerableCisco
cpe:2.3:o:cisco:ios:12.1ez:*:*:*:*:*:*:*12.1ezVulnerableCisco
cpe:2.3:o:cisco:ios:12.1t:*:*:*:*:*:*:*12.1tVulnerableCisco
cpe:2.3:o:cisco:ios:12.1ya:*:*:*:*:*:*:*12.1yaVulnerableCisco
cpe:2.3:o:cisco:ios:12.1yc:*:*:*:*:*:*:*12.1ycVulnerableCisco
cpe:2.3:o:cisco:ios:12.1yd:*:*:*:*:*:*:*12.1ydVulnerableCisco
cpe:2.3:o:cisco:ios:12.2:*:*:*:*:*:*:*12.2VulnerableCisco
cpe:2.3:o:cisco:ios:12.2t:*:*:*:*:*:*:*12.2tVulnerableCisco
cpe:2.3:o:cisco:ios:12.2xa:*:*:*:*:*:*:*12.2xaVulnerableCisco
cpe:2.3:o:cisco:ios:12.2xd:*:*:*:*:*:*:*12.2xdVulnerableCisco
  • cpe:2.3:o:cisco:ios:12.1e:*:*:*:*:*:*:* Versions 12.1e Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:12.1ez:*:*:*:*:*:*:* Versions 12.1ez Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:12.1t:*:*:*:*:*:*:* Versions 12.1t Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:12.1ya:*:*:*:*:*:*:* Versions 12.1ya Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:12.1yc:*:*:*:*:*:*:* Versions 12.1yc Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:12.1yd:*:*:*:*:*:*:* Versions 12.1yd Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:12.2:*:*:*:*:*:*:* Versions 12.2 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:12.2t:*:*:*:*:*:*:* Versions 12.2t Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:12.2xa:*:*:*:*:*:*:* Versions 12.2xa Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:12.2xd:*:*:*:*:*:*:* Versions 12.2xd Vulnerable ·Cisco
Show 3 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:cisco:ios:12.2xe:*:*:*:*:*:*:*12.2xeVulnerableCisco
cpe:2.3:o:cisco:ios:12.2xh:*:*:*:*:*:*:*12.2xhVulnerableCisco
cpe:2.3:o:cisco:ios:12.2xq:*:*:*:*:*:*:*12.2xqVulnerableCisco
  • cpe:2.3:o:cisco:ios:12.2xe:*:*:*:*:*:*:* Versions 12.2xe Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:12.2xh:*:*:*:*:*:*:* Versions 12.2xh Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios:12.2xq:*:*:*:*:*:*:* Versions 12.2xq Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2001-1183
  2. 2026-10-03 Alias added: GHSA-xfqr-hx55-mjcw
  3. 2026-10-21 EPSS moved to the 90th–95th percentile
  4. 2026-10-25 EPSS moved to the 50th–90th percentile
  5. 2026-10-27 EPSS moved to the 90th–95th percentile

References

Patch 2

Other 1

  • TI-2018-00138 Improper input validation in Cisco IOS and IOS XE KEVCVSS 3.1CRITICAL 9.8
  • TI-2017-09019 Improper input validation in Cisco IOS and IOS XE KEVCVSS 3.1CRITICAL 9.8
  • TI-2017-02977 Improper input validation in Cisco IOS and IOS XE Software KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-00135 Memory corruption in Cisco IOS, IOS XE, and IOS XR KEVCVSS 3.1HIGH 8.8
  • TI-2017-04499 Memory corruption in Cisco IOS KEVCVSS 3.1HIGH 8.8
  • TI-2017-04498 Memory corruption in Cisco IOS KEVCVSS 3.1HIGH 8.8
See all 617 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences