Buffer overflow in Haproxy

CVE-2020-11100

In hpack_dht_insert in hpack-tbl.c in the HPACK decoder in HAProxy 1.8 through 2.x before 2.1.4, a remote attacker can write arbitrary bytes around a certain location on the heap via a crafted HTTP/2 request, possibly causing remote code e…

Vulnerability class: Buffer Overflow

EPSS: 0.607 (99.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2020-11100?
CVE-2020-11100 is a high-severity vulnerability in Haproxy, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2020-04-02.
How severe is CVE-2020-11100?
High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2020-11100 known to be exploited?
2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.