9.8

CVE-2003-0899: acme thttpd Incorrect Calculation of Buffer Size

CVSS: 9.8v3.1CriticalModified
Published 30-10-2003Last modified 08-08-2024
Open JSON

Vulnerability summary

CVE-2003-0899 is a critical (CVSS 9.8) Incorrect Calculation of Buffer Size vulnerability in acme thttpd. EPSS estimates a 22.19% chance of exploitation in the next 30 days, higher than 97.6% of scored vulnerabilities. 4 public exploits are recorded.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
22.19%
0%100%
High · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits4reference, exploit-database

Advisory lineage

Upstream 0 · Downstream 1
DSA-396

Timeline

  1. 30-10-2003
    PublishedVulnerability first disclosed.
  2. 08-08-2024
    Last modifiedVulnerability information updated.

Description

Buffer overflow in defang in libhttpd.c for thttpd 2.21 to 2.23b1 allows remote attackers to execute arbitrary code via requests that contain '<' or '>' characters, which trigger the overflow when the characters are expanded to "&lt;" and "&gt;" sequences.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

22.19%

Chance of exploitation in the next 30 days

Percentile

98%

Versus all other CVEs

30-day change

0.00 pp

From 22.19% on 20-09-2026

20-09-202620-10-2026
EPSS score
22.19%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

4 found
  • referenceUnverified

    Exploit Reference (securityfocus.com)

    Maturity: unknown

  • referenceUnverified

    Exploit Reference (marc.info)

    Maturity: unknown

  • exploit-databasedoslinuxVerified

    thttpd 2.2x - 'defang' Remote Buffer Overflow (PoC)

    Maturity: poc

Show all 4 exploits
  • exploit-databaseremotelinuxVerified

    thttpd 2.2x - 'defang' Remote Buffer Overflow

    Maturity: weaponized

Weaknesses

CWE · root cause

Affected systems

Acme1 product
  • thttpd≥ 2.21, < 2.23 | 2.23 | 2.23:b1

1 vendor · 1 product

References

7 links