Description
pptpgre.c in PoPToP Point to Point Tunneling Server (pptpd) before 1.3.4 allows remote attackers to cause a denial of service (PPTP connection tear-down) via (1) GRE packets with out-of-order sequence numbers or (2) certain GRE packets that are processed using a wrong pointer and improperly dequeued.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | pptpd | 1.3.4-1 | — |
| Debian 13 | pptpd | 1.3.4-1 | — |
| Debian 12 | pptpd | 1.3.4-1 | — |
| Debian 4.0 | pptpd | 1.3.0-2etch1 | DSA-1288-2, DSA-1288-1 |
Advisories 2
- DSA-1288-2 pptpd - regression Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-1288-1 pptpd Debian Security (DSA / DLA) · Mar 9, 2026
References
- ADV-2007-1743 vdb-entry
- SUSE-SR:2007:019 vendor-advisory
- 1018064 vdb-entry
- 23886 vdb-entry
- http://sourceforge.net/project/shownotes.php?release_id=501476&group_id=44827
- 2007-0017 vendor-advisory
- 26987 third-party-advisory
- USN-459-1 vendor-advisory
- SUSE-SR:2007:010 vendor-advisory
- 25255 third-party-advisory
- USN-459-2 vendor-advisory
- GLSA-200705-18 vendor-advisory
- 25220 third-party-advisory
- DSA-1288 vendor-advisory